TWI666965B - Heater, fixing device including the same, image forming device and heating device, and method for manufacturing heater - Google Patents

Abstract

Provides multiple resistance heating elements with heat generated by energization A heater having a resistance value corrected for each of the resistance heating wires and a fixing device, an image forming device, a heating device, and a method for manufacturing the heater.

The heater of the present invention is provided with a heater The heater of the plurality of heating portions (10) in (11) is provided with: two power supply wirings (13a, 13b), which are separated by each heating portion and separated from each other and are made of a conductive material ; Resistance heating wiring (12), which is connected to each heating section, using a resistance heating material to connect the power supply wiring; wiring bridge (14), which is for each heating section, When the resistance value of the measured resistance heating wire exceeds a predetermined range, at least one of the two points of the resistance heating wire and between the point of the resistance heating wire and the power supply wiring is connected by a conductive material. ; And a power supply bridge (15), which connects one of the power supply wirings and the other power supply wiring of each heat generating part to each other through a conductive material.

Description

Heater, fixing device including the same, image forming device and heating device, and method for manufacturing heater

The present invention relates to a heater, a fixing device having the same, an image forming device and a heating device, and a method for manufacturing a heater. Specifically, it relates to a heater including a plurality of resistance heating wires that generate heat by being energized, and the resistance value of each resistance heating wire is corrected, and a fixing device, an image forming device, a heating device, and a heater having the same method.

As a heating means for heat-treating an object, there is known a heater in which a resistance heating wire is provided on the surface of a stainless steel plate or a ceramic plate. The heater shown above can be thin and compact. Therefore, for example, the heater is incorporated in a photocopier or printer, and toner or ink is used for the purpose of recording media. It is used for the purpose of uniformly heating and drying an object to be processed, such as a panel, in a dryer. Among these uses, a heater is known in which a heating surface of a heater is divided into a plurality of heating portions (cells), and a temperature distribution in a surface to be heated is made as uniform as possible (see, for example, a patent). Reference 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 formed resistance heating element. Therefore, in order to form a high-quality heater, the resistance value must be adjusted (see, for example, Patent Document 2).

[Prior technical literature] [Patent Literature]

[Patent Document 1] WO2014 / 034744

[Patent Document 2] Japanese Patent Laid-Open No. 2001-313154

The aforementioned Patent Document 1 describes a heater including a plurality of resistance heating wires (cell patterns) laid using a conductive material whose resistance value changes depending on temperature, and each of the resistance heating wires is provided. It is constituted by electrical parallel connection. With this heater, each resistance heating wiring system has substantially the same heating characteristics. Therefore, the heat generated by the respective unit pattern portions (heating portions) becomes substantially the same, and the object to be heated can be heated substantially uniformly.

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, when the heating characteristics are made uniform throughout the entire heating region, the resistance value of each resistance heating wiring must be adjusted. The aforementioned Patent Document 2 describes an invention in which a resistance value is adjusted by forming a conductive laminate on a resistor pattern. However, in the heater or the like provided with a plurality of heat generating portions as described above, the resistance heat generation The wiring pattern of the lines is more refined. On the other hand, with the diversification of the shape and size of the heater, it is increasingly difficult to form the resistor heating wiring with high accuracy throughout the entire heating region by printing or the like. For example, if the heating area of the heater is a curved surface, the so-called cylinder printing technology can be used to form the resistance heating wiring, but it is extremely difficult to form a highly accurate resistance heating wiring across the heating area. Therefore, there is a need for a heater that can be manufactured by a more excellent and simple process, and that the heat generation characteristics of the plurality of heat generating portions are more uniform.

The present invention has been made in view of the above-mentioned actual situation, and an object thereof is to provide a heater in which a plurality of heating portions are provided on a heating surface and resistance heating wirings laid for each heating portion are connected in parallel. A heater whose characteristics are corrected with high accuracy, a fixing device having the same, an image forming device and a heating device, and a manufacturing method of the heater.

The present invention is as follows.

The gist of the heater described in claim 1 is that the heater is provided with a plurality of heat generating portions arranged on a base, and is characterized in that it includes: two power supply wirings that generate heat for each of the foregoing The parts are separated and separated from each other and are made of conductive materials. Resistive heating wires are connected to each of the aforementioned heating parts, and each of the aforementioned power supply wirings is connected by using a resistive heating material; 1 or more corrections The bridge is for each of the aforementioned heating parts, and if the above-mentioned resistance heating configuration is measured after the wiring, When the resistance value between the two ends of the wire exceeds a predetermined range, at least one of the two points of the resistance heating wiring and the one point of the resistance heating wiring and the power supply wiring is connected with a conductive material. And a power supply bridge that connects one of the power supply wirings and the other power supply wiring of each of the heat generating portions to each other through a conductive material.

The gist of the heater described in claim 2 is that in claim 1, at least one of the correction bridges is formed by connecting the wires of the resistance heating wiring.

The gist of the heater described in claim 3 is that, in claim 1 or 2, at least one of the correction bridges is formed on the resistance heating wiring line.

The gist of the heater described in claim 4 is that, in any one of claims 1 to 3, at least two points of the aforementioned correction span bridge system will have the same length at each end of the resistance heating wiring and each end side. The aforementioned power supply wirings are respectively connected.

The gist of the heater described in claim 5 is that, in any one of claims 1 to 4, at least one of the heated object and the heater is in a state facing the heated object. A heater that scans in a predetermined scanning direction and heats the object to be heated. Each of the heating portions is arranged in a direction orthogonal to the scanning direction. In each of the heating portions, the resistance heating wiring is provided. A plurality of main pattern portions provided at an angle within a predetermined range with respect to the aforementioned orthogonal direction.

The gist of the heater described in claim 6 is that in the claim 5, the cross-sectional shape of the substrate in the scanning direction is the same as that in the scanning direction. Each of the heat generating portions is disposed on the convex surface or a surface on the opposite side of the arc-shaped surface having an orthogonal axis as a center and a convex shape on the side opposite to the object to be heated.

The gist of the heater described in claim 7 is that in any one of claims 1 to 7, the resistance heating material is a conductive material whose resistance value changes depending on temperature, the correction bridge and the power supply bridge The conductive material used is a conductive paste.

The gist of the fixing device described in claim 8 is to include a heater as in any of claims 1 to 7.

The gist of the image forming apparatus described in claim 9 is to include a heater as in any of claims 1 to 7.

The gist of the heating device described in claim 10 is to include a heater as in any one of claims 1 to 7.

The gist of the method for manufacturing a heater according to claim 11 is: a method for manufacturing a heater having a plurality of heat generating portions arranged on a base, and the method is characterized by including: a wiring forming process for power supply; The conductive material is used to form two power supply wirings that are separated and separated from each other. The resistance heating wiring formation process is based on the use of a resistance heating material in each of the heating portions. The resistance heating wiring is formed by wiring connection. The measurement process is to measure the resistance value between the power supply wirings for each of the heating parts by using a resistance value measuring means after forming the power supply wiring and the resistance heating wiring. ; Computing engineering, which uses computing means for each of the aforementioned heating parts, the resistance value and Compare the predetermined range. If the resistance value exceeds the predetermined range, find the length that the resistance heating wiring is substantially shortened to correct the resistance value to the predetermined range. In order to shorten the length of the resistance heating wiring by the length of the correction length, a conductive material is formed between two points of the resistance heating wiring and between one point of the resistance heating wiring and the power supply wiring. At least one connected span bridge of 1 or more; and a span bridge forming project for power supply, which forms one of the aforementioned power supply wirings of each of the aforementioned heat generating portions with each other and the other aforementioned power supply wiring by using a conductive material. Cross bridges for power supply connected to each other.

The gist of the method for manufacturing the heater described in claim 12 is that in claim 11, the at least one correction span bridge system is formed by connecting the lines of the resistance heating wiring by the aforementioned correction span bridge formation process. .

The gist of the method for manufacturing a heater described in claim 13 is that in claim 11 or 12, by the aforementioned correction span bridge formation process, at least one of the correction span bridge systems is formed by overlapping on the line of the resistance heating wiring.

The gist of the method for manufacturing the heater described in claim 14 is that, in any one of claims 11 to 13, by the aforementioned correction bridge forming process, at least two of the aforementioned correction bridge systems are used to wire the heat generated by the resistor. Each end is formed by dots having the same length and the power supply wiring on each end side is connected to each other.

The gist of the method for manufacturing a heater according to claim 15 is that, in any one of claims 11 to 14, the object to be heated and the heater are placed in a state facing the object to be heated. At least one of the The method of manufacturing a heater for heating the object to be heated by scanning in the scanning direction, each of the heating parts is arranged in a direction orthogonal to the scanning direction, and the heating part is formed by the resistance heating wiring. In the above, the resistance heating wiring is formed by including a plurality of main pattern portions provided at an angle within a predetermined range with respect to the orthogonal direction.

The gist of the method for manufacturing a heater according to claim 16 is that, in any one of claims 11 to 15, the cross-sectional shape of the substrate in the scanning direction is centered on an axis orthogonal to the scanning direction. Each of the heat generating portions is arranged in a circular arc shape that is convex to the side opposite to the object to be heated, and is disposed on the convex surface or a surface opposite to the convex surface.

The gist of the method for manufacturing a heater according to claim 17 is that, in any one of claims 11 to 16, the resistance heating material is a conductive material whose resistance value changes depending on temperature, the correction bridge and the power supply. The conductive material used for the bridge is a conductive paste.

With the heater described in claim 1, the resistance value of the resistance heating wiring laid for each heating portion is corrected by a correction bridge, so that the heating characteristics of all heating portions can be uniformized with high accuracy, and can be The object to be heated is uniformly heated. In addition, only the correction span bridge is provided to correct the resistance value, so regardless of the shape of the heater, it can be manufactured by simple engineering. In the manufacture of heater products, even when it is difficult to form the resistance value of the heating portion with high accuracy, if the resistance heating wiring is formed at least so that the resistance values of all the heating portions exceed a predetermined value, the By correcting the crossover bridge for each heating part, the quality and yield of the product can be greatly improved.

With the heater described in any one of claims 2 to 4, a correction bridge can be provided at an appropriate position in accordance with the wiring pattern of each heating portion, the correction amount of the resistance value, the shape of the heater, and the like.

With the heater described in claim 5, the heater and the object to be scanned can be uniformly heated 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 close to the scanning direction, the object to be heated can be efficiently heated.

The heater according to claim 6 can be formed as a heater suitable for being incorporated in a roller for applications in which a heated object is scanned and heated by a roller.

With the heater described in claim 7, it is possible to obtain the effect that the heat generation state is uniformized autonomously throughout each heat generation section and between the heat generation sections. In addition, the correction span bridge and the span bridge system for power supply can be manufactured by a simple method.

With the manufacturing method of the heater described in claim 11, even if there is a difference in the resistance value of each resistance heating wire formed, if the resistance value exceeds a predetermined range, the resistance value is corrected by setting a correction bridge. Therefore, A heater capable of uniformizing the heating characteristics of all the heating portions with high accuracy and heating the object to be heated uniformly can be manufactured. In addition, since the correction length is obtained by measuring only the resistance value, and the correction bridge is provided so as to shorten the portion of the correction length, the heater can be manufactured inexpensively by a simple manufacturing method regardless of the shape of the heater.

Manufacture of a heater described in any one of claims 12 to 14 In the method, a correction bridge can be provided at an appropriate position in accordance with the wiring pattern of each heating portion, the amount of resistance value correction, and the shape of the heater.

By the method for manufacturing a heater described in claim 15, regardless of the size of the object to be heated, a heater capable of uniformly heating the heater and the object to be scanned can be manufactured. In addition, since the main pattern portion of the resistance heating wiring is provided in a direction orthogonal to or close to the scanning direction, a heater capable of efficiently heating an object to be heated can be manufactured.

According to the manufacturing method of the heater described in claim 16, the heater suitable for being incorporated in the roller can be manufactured for use in which the object to be heated is scanned and heated by the roller. Since the heating area of the heater is a curved surface, even if it is difficult to form all the resistance heating wiring across the entire heating area with high accuracy, it is possible to manufacture a heater with uniform heating characteristics by appropriately forming a correction bridge.

According to the method for manufacturing a heater described in claim 17, it is possible to manufacture a heater that can uniformly generate heat in a self-regulating manner throughout each of the heat generating sections and between the heat generating sections. In addition, a simple method can be used to set a correction span bridge and a span bridge for power supply.

1‧‧‧ heater

10‧‧‧Fever

11‧‧‧ Matrix

12‧‧‧ resistance heating wiring

121‧‧‧Main pattern department

122‧‧‧Connection pattern department

13, 13a, 13b‧‧‧ Power supply wiring

131, 131a, 131b‧‧‧ Power supply terminal

14, 141, 142, 143, 144‧‧‧

15, 15a, 15b‧‧‧ Power supply bridge

2‧‧‧ Object to be heated

4‧‧‧Image forming device

41‧‧‧laser scanner

42‧‧‧Mirror

43‧‧‧ charged device

44‧‧‧photosensitive drum

45‧‧‧Developer

46‧‧‧ transfer drum

47‧‧‧ transfer roller

5‧‧‧ fixed device (fixed means)

51‧‧‧ fixed roller

52‧‧‧Pressure roller

53‧‧‧heater holder

54‧‧‧Pressure roller

P‧‧‧Recording Media

Fig. 1 is a schematic plan view showing the structure of a heater according to the present invention.

FIG. 2 is a schematic plan view showing a state in which a power supply wiring and a resistance heating wiring are applied to a base of a heater.

FIG. 3 is a schematic plan view for explaining a method of arranging a correction span bridge.

Fig. 4 is a schematic plan view showing an example in which correction bridges are provided in all the heat generating portions.

Fig. 5 is a schematic plan view of an example of a heater.

Fig. 6 is a schematic plan view of another example of the heater.

Fig. 7 is a schematic plan view of another example of the heater.

FIG. 8 is a diagram for explaining a heater that scans an object to be heated in one scanning direction to perform heating.

FIG. 9 is a schematic plan view for explaining a wiring pattern of the resistance heating wiring.

Fig. 10 is a schematic perspective view (a) and a cross-sectional view (b) showing an example in which a heating portion is provided on a convex surface of a heater having a circular arc shape in cross section.

11 is a schematic perspective view (a) and a cross-sectional view (b) showing an example in which a heat generating portion is provided on a concave surface of a heater having a circular arc shape in cross section.

FIG. 12 is a schematic plan view showing an example of the arrangement of power supply terminals provided on the base of the heater.

Fig. 13 is a schematic perspective view showing an example of a fixing device using the heater.

FIG. 14 is a schematic perspective view showing another example of a fixing device using the heater.

FIG. 15 is a schematic diagram showing an example of an image forming apparatus using the heater.

Fig. 16 is a schematic plan view for explaining a method of manufacturing the heater of the present invention, (a) shows formation of power supply wiring, (b) shows formation of resistance heating wiring, and (c) shows formation of correction bridge. , (D) represents the confession Formation of electrical bridges.

Fig. 17 is a plan view of the heater of the embodiment.

FIG. 18 is a graph showing the temperature distribution due to the position on the substrate of the heater of the example.

The present invention will be described in detail below with reference to the drawings.

[1] heater

As shown in FIG. 1, the heater (1) of this embodiment is a heater having a plurality of heat generating portions (10) arranged on a base (11), and is characterized in that: 10) Two power-supply wirings (13 (13a, 13b)) made of a conductive material that are separated and provided separately from each other; in each heating portion (10), each power-supply wiring ( 13a, 13b) The resistance heating wiring (12) which is wired in a connected manner; for each heating part (10), if the resistance value between the ends of the resistance heating wiring (12) measured after the aforementioned wiring exceeds a predetermined value In the range, at least one of two points between the resistance heating wire (12) and one point between the resistance heating wire (12) and the power supply wiring (13) is connected by a conductive material. Bridge (14); and a power supply bridge (15) that connects one of the power supply wirings (13a) and the other power supply wiring (13b) of each heating part (10) with each other through a conductive material. ).

The base body (11) may be provided with power supply terminals (131 (131a, 131b)) and the like for supplying power to the heater 1 from the outside. In addition, in order to protect the above-mentioned wirings and bridges, a protective layer or an overcoat layer made of an insulating material may be laminated.

The aforementioned "substrate (11)" is a substrate supporting a circuit of the heater 1 composed of the resistance heating wiring 12, the power supply wiring 13, the correction bridge 14, the power supply bridge 15, and the power supply terminal 131.

The aforementioned "heating part (10)" refers to a circuit provided with one resistance heating wire 12 and two power supply wires 13 (13a, 13b) connected to each end thereof, or a division on a substrate 11 on which the circuit is arranged . For example, the heating surface (heating area) of the heater 1 shown in FIG. 1 is provided with six heating portions 10, and the aforementioned circuit is provided for each heating portion 10. The number or division method of the heat generating portions 10 is not particularly limited. In FIG. 1, each heat generating portion 10 is divided so as to be inclined with respect to the longitudinal direction of the base 11, but may be divided into orthogonal directions with respect to the longitudinal direction. In addition, in this example, the plurality of heat generating portions 10 are arranged in one row in the lateral direction of the base body 11, but they may also be arranged in two or more rows, or may be arranged in a matrix form in the vertical and horizontal directions.

The size or shape of the base 11 is not particularly limited, and its thickness is preferably, for example, 0.1 to 20 mm according to the material or size of the base 11.

The material of the substrate 11 is not particularly limited as long as it can support a circuit formed by the heater 1 to generate heat on its surface. For the substrate 11, for example, a metal, a ceramic, and a composite material thereof can be used. If a conductive material such as metal is used, the base 11 can be provided with an insulating layer on the conductive material. (Not shown), and the circuit is formed on the insulating layer.

Examples of the metal used for the substrate 11 include steel and the like, and stainless steel may be used as appropriate. The type of stainless steel is not particularly limited, and ferritic stainless steel and / or austenitic stainless steel are preferred. Among these stainless steels, those having excellent heat resistance and / or oxidation resistance are particularly preferred. Examples include SUS430, SUS436, SUS444, and SUS316L. These systems can be used alone or in combination of two or more.

In addition, as the metal constituting the base body 11, aluminum, magnesium, copper, and alloys of these metals can be used. These systems can be used alone or in combination of two or more. Among them, since the specific gravity of aluminum, magnesium, and alloys thereof (aluminum alloy, magnesium alloy, Al-Mg alloy, etc.) is small, the use of these materials can reduce the weight of the cost heater. In addition, copper and its alloys are excellent in thermal conductivity, so by adopting these, it is possible to improve the uniformity of the heater.

As described above, when a conductive material is used as the substrate material, the base 11 is formed 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 a circuit provided on the base 11 and between wirings of the circuit. When a metal (stainless steel, etc.) is used as the substrate material, from the viewpoint of thermal expansion balance of the material of the insulating layer, glass is preferred, and crystallized glass and semi-crystallized glass are more preferred. Specifically, SiO ₂ -Al ₂ O ₃ -MO-based glass is preferred. Here, MO is an oxide of an alkaline earth metal (MgO, CaO, BaO, SrO, etc.). The thickness of the insulating layer is not particularly limited, but is preferably 60 to 120 μm.

When the substrate 11 is formed of ceramics, it is preferable to maintain electrical insulation between the circuit provided on the substrate 11 and the wiring between the circuits at a high temperature. The ceramics shown above include, for example, alumina, aluminum nitride, zirconia, silica, mullite, spinel, cordierite, and silicon nitride. These systems can be used alone or in combination of two or more. Among these, alumina and aluminum nitride are preferred. In addition, for a composite material of metal and ceramic, a series of examples include SiC / C, SiC / Al, and the like. These systems can be used alone or in combination of two or more.

The aforementioned "power supply wiring (13)" refers to two (13a, 13b) wirings or islands formed by using a conductive material in order to supply power to the resistance heating wiring (12) laid on each heating portion 10 . The shape or size of each power supply wiring 13 is not particularly limited. The two power supply wirings (13a, 13b) are electrically separated for each heating portion 10. In addition, the two power supply wirings (13a, 13b) are provided separately from each other, and power is supplied between the two.

The portion on the base 11 on which the power supply wiring 13 is provided, or the wiring pattern of the power supply wiring 13 is not particularly limited as long as power can be supplied to both ends of the resistance heating wiring (12) provided in each heating unit 10. For example, as shown in FIG. 1, in each heating portion 10, one of the power supply wirings 13 a may be disposed on one end of the base 11, and the other power supply wiring 13 b may be disposed on the base 11. On the other end. In addition, when the plurality of heat generating portions 10 are arranged in two or more rows on the base 11, or In the case of a matrix, etc., the power supply wiring 13 can be appropriately set in accordance with the arrangement of the heat generating section 10.

The aforementioned "resistive heating wiring (12)" is a wiring formed by using a resistance heating material so that two power supply wirings 13 (13a, 13b) are connected, and it can be heated by applying resistance according to the resistance value. 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 systems can be used alone or in combination of two or more. When two or more types are used in combination, the alloy can be formed. More specifically, silver-palladium alloy, silver-platinum alloy, platinum-rhodium alloy, silver, copper, gold, and the like can be used.

In addition, the resistance heating material constituting the resistance heating wiring 12 is located in each heating portion 10, and it is preferable that the plurality of heating portions 10 have a positive temperature coefficient of resistance in order to exert a self-temperature equalizing effect (self-temperature complementary effect). 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 formed as a resistance heating material, the temperature coefficient of resistance at 0 to 600 ° C is preferably 500 to 4000 ppm / ° C. In addition, when Mo and / or W is formed as a resistance heating material, the temperature coefficient of resistance at 0 to 1000 ° C is preferably 2000 to 4000 ppm / ° C.

As described above, when the resistance heating wiring 12 is formed using a resistance-temperature-dependent material, it can achieve self-temperature equalization between each heating portion 10 and between the plurality of heating portions 10.

For example, when the temperature of one heating portion 10 decreases, the heating portion 10 The resistance value of the resistance heating wiring 12 will also decrease. The plurality of heating portions 10 are electrically connected in parallel. Therefore, if the resistance value of the resistance heating wiring 12 of one heating portion 10 decreases, the amount of current flowing to the resistance heating wiring 12 increases, so the amount of heat generated by the heating portion 10 will be increased. increase. As described above, each of the plurality of heat generating portions 10 is self-balanced toward the steady state individually.

In addition, for example, if the second heat generating portion 10 is sandwiched between the first heat generating portion 10 and the third heat generating portion 10, if the temperature of the second heat generating portion 10 decreases, the heat is transferred from the surrounding first and third heat generating portions 10 Added. In this way, the electric current to the first heat generating portion 10 and the third heat generating portion 10 whose temperature is decreased increases, and the effect of reducing the temperature due to the captured heat is to be recovered autonomously. That is, the heat-generating portion 10 around the second heat-generating portion 10 operates to complement the temperature reduction of the second heat-generating portion 10.

As described above, this heater is controlled autonomously so that the entire heat generation portion 10 generates heat uniformly. From this point of view, the base 11 is preferably composed of a metal excellent in thermal shock resistance and excellent in thermal conductivity.

The size (width, length, thickness) or shape (wiring pattern) of the resistance heating wiring 12 is not particularly limited, and may be appropriately determined according to the resistivity of the resistance heating material used and the required resistance value. .

When the heat generating portions 10 are to be formed to have substantially the same amount of heat generation, the resistance heating lines 12 in each heat generating portion 10 may be formed so as to have substantially the same resistance value. At this time, as shown in FIG. 1, the resistance heating wires 12 of each heating portion 10 may have the same line length, line width, and thickness. It is formed by the same wiring pattern. FIG. 2 shows a state where the resistance heating wiring 12 as described above is formed on the base 11 together with the power supply wiring 13. Here, having substantially the same calorific value means that each heat generating portion 10 has substantially the same resistance temperature coefficient and resistance value under the same measurement conditions. For example, it may be formed such that the difference in the temperature coefficient of resistance between the heating portions is within ± 20%, and the difference in the resistance value between the heating portions may be within ± 10%.

In addition, even if the resistance heating wiring 12 is a wiring pattern that varies depending on the heating portion 10, the heat generation (resistance value) of each heating portion 10 can be made substantially the same. In addition, even if a resistance heating material that is different depending on the location inside the heating portion 10 is used, or different line widths, lengths, or wiring patterns are used, the heat generation (resistance value) of the heating portion 10 can be made substantially the same.

In addition, even when it is intended that the heat generating portions 10 have different heat generation amounts, the resistance heating material, size, wiring pattern, and the like of the resistance heating wiring 12 can be appropriately adjusted according to the desired heat generation amount, as described above. select.

The resistance heating wiring 12 can be wired with an arbitrary pattern. In FIG. 1, the wiring pattern of the resistance heating wiring 12 in each heating portion 10 includes a plurality of main pattern portions laid in parallel with the long side of the base 11 and is connected in series to each main pattern portion Laying connection pattern section. This wiring pattern can be variously modified. For example, the main pattern portions may not be parallel to the sides of the base 11, and the main pattern portions may not be parallel to each other. In addition, all or part of the main pattern portions may be connected in parallel. this In addition, the connection pattern portion is not limited to a linear shape as in this example, and may be a curved shape. Alternatively, a wiring pattern in which the main pattern portions are connected in a zigzag manner may be used.

The aforementioned “correction bridge (14)” is in each heating portion 10, and if it is wired between two ends of the resistance heating wiring 12 between the two power supply wirings 13 (that is, between the power supply wirings 13a and 13b) When the resistance value exceeds the predetermined range, the short-circuit wiring is used 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. This shortened length is called "corrected length" (L). The "predetermined range" can be arbitrarily set (described later). Of course, if the resistance value of the resistance heating wire 12 is within a predetermined range, it is not necessary to provide a correction bridge 14.

In the case of the correction bridge 14, a conductive material is used. The conductive material may be metal, and other conductive materials (for example, the same material as the resistance heating wiring 12) may be used as long as the correction length can be short-circuited. A conductive paste such as a silver paste is preferably 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 correction bridges 14 or the locations where they are provided in each heating portion 10 is not limited as long as the substantial length of the resistance heating wiring 12 is shortened by the correction length L.

FIG. 3 shows an arrangement example of the correction bridge 14. The correction bridge 14 shortens the substantial length of the resistance heating wiring 12 by connecting one or more points between the resistance heating wiring 12 and / or one point of the resistance heating wiring 12 and the power supply wiring 13. Connection (short circuit) By the way.

In the figure (a), 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. Thereby, the section where one end of the resistance heating wire has a certain length is short-circuited.

In the figure (b), at least one correction bridge 143 is provided so as to connect the lines of the resistance heating wiring 12. Thereby, the two points of the resistance heating wire 12 connected by the correction bridge 143 are short-circuited.

In the figure (c), at least one correction bridge 144 is provided so as to overlap on the line of the resistance heating wire 12. Thereby, the resistance heating wiring 12 between two points of both ends of the correction bridge 144 is short-circuited.

In the figure (d), at least two correction bridges 142 are provided so that points having the same length at each end of the resistance heating wiring 12 are connected to power supply wirings (13a, 13b) on each end side. . Thereby, the sections in which each end of the resistance heating wire 12 has a certain length are short-circuited. FIG. 4 shows an example in which two correction bridges 14 (142) are provided in each heat generating section 10.

By appropriately setting the correction bridge 14 as described above, the length of the resistance heating wiring 12 can be substantially reduced by a total portion of the correction length L.

The “power supply bridge (15)” is a power connection wiring that connects one of the power supply wirings 13a and the other power supply wiring 13b to each other using a low-resistance conductive material. By forming a power supply bridge 15 between the heat generating portions 10, all the heat generating portions 10 (resistive heat generating wirings 12) are electrically connected in parallel. As the material of the power supply bridge 15, a silver paste or the like can be used as the conductive paste.

The correction bridge 14 and the power supply bridge 15 are laminated on the power supply wiring 13 or 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. Any of the figures shows a circuit in which all the heating units 10 are connected in parallel by the power supply bridge 15.

The heater 1 of FIG. 5 is configured by a wiring pattern of the heat generating portion 10 which is the same as that of FIG. 1.

The heater 1 shown in FIG. 6 is such that each heat generating portion 10 is arranged perpendicular to the long side of the base 11 and the main pattern portion of the wiring pattern parallel to the long side of the base 11 is connected in series.

The heater 1 of FIG. 7 is connected in parallel to the main pattern portion of each heat generating portion 10 in a wiring pattern parallel to the long side of the base 11.

The structure of the wiring pattern can be appropriately modified.

FIG. 8 illustrates that at least one of the heated object 2 and the heater 1 is scanned in a predetermined scanning direction D in a state where the heating surface of the heater 1 and the heated object 2 face each other, and the heated object 2 is heated. Illustration of heater. At this time, the object to be heated 2 is scanned relative to the direction D on the heater 1. The configuration of the heating portion 10 on the heater 1 or the wiring pattern of the resistance heating wiring 12 may be appropriately selected, and may be configured as shown in, for example, FIGS. 5 to 7. In the heater 1 used as described above, each of the heat generating portions 10 is preferably arranged in a direction orthogonal to the scanning direction D. Thereby, regardless of the width or position of the object 2 to be heated, since the aforementioned self-temperature equalizing effect is effectively performed, the object 2 to be heated can be uniformly heated.

In addition, if the object to be heated 2 is scanned in the direction of D, In this case, in each of the heat generating portions 10, it is preferable that the main pattern portion of the resistance heat generating wiring 12 and the scanning direction D are substantially orthogonal to each other. FIG. 9 shows an example of a wiring pattern of the resistance heating wiring 12 as described above. As shown in (a) of this figure, the resistive heating wiring 12 can have a plurality of main pattern portions 121 provided at an angle θ within a predetermined range with respect to the orthogonal direction, and a method of connecting the main pattern portions 121. The pattern of the connection pattern portion 122 is provided for wiring. The angle θ within the predetermined range may be formed, for example, from -30 ° to 30 °, and preferably from -15 ° to 15 °. With the angle θ = 0 °, that is, the main pattern portion 121 is optimally set in a direction orthogonal to the scanning direction D. Each of the main pattern portions 121 may not be parallel to each other, and the connection pattern portion 122 is not limited to a linear shape, and may be a curved shape. In addition, each of the main pattern portions 121 may be electrically connected in series, or all or part of the main pattern portions 121 may be electrically connected in parallel. In addition, as shown in the figure (b), the resistance heating wiring 12 may be formed as a wiring pattern in which the main pattern portion 121 is connected in a zigzag manner.

As described above, the main pattern portion of the resistance heating wiring 12 is set at an angle θ within a predetermined range with respect to the direction orthogonal to the scanning direction D or the direction orthogonal to the scanning direction D, thereby making it possible to scan the The object to be heated 2 is efficiently heated.

Among them, in each heating portion 10, one of the power supply wirings (13a) may be disposed on one side of the aforementioned orthogonal direction on the base 11, and the other power supply wiring (13b) may be disposed. On the other side of the aforementioned orthogonal direction on the base body 11.

As mentioned above, if the heating surface of the heater 1 and In the state where the hot object 2 is facing, the heated object 2 and the heater 1 are scanned in a predetermined scanning direction D to scan the heater 1 to heat the heated object 2, and the cross-sectional shape of the scanning direction D of the base 11 is It can be formed into a circular arc shape with the axis orthogonal to the scanning direction D as the center and a convex shape on the opposite side to the object 2 (that is, a cylinder or a cylinder is cut out in a plane parallel to the center axis shape). Next, as shown in FIG. 10, each heat generating part 10 can be arrange | positioned on the said convex surface. Moreover, as shown in FIG. 11, it may be arrange | positioned on the surface (concave surface) on the opposite side. By forming the heater 1 into a cylindrical drum as described above, and rotating the drum, the object to be heated 2 scanned on the drum can be efficiently heated (see FIG. 14).

The base 11 of the heater 1 may be provided with power supply terminals 131 (131a, 131b) for externally connecting a power source. One of the power supply terminals 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 heating portions 10 are connected by the power supply bridge 15 described above, the power supply terminals 131 may be connected to the power supply wirings 13 of at least one of the heating portions 10. The placement location of the power supply terminal 131 on the base 11 is not particularly limited, and it may be provided at, for example, the locations shown in FIGS. 12 (a) to (c).

The heater 1 is incorporated in an image forming apparatus or a fixing device such as a printer, a photocopier, and a facsimile, and can be used as a fixing heater for fixing toner or ink on a recording medium. In addition, it can be incorporated into a heating machine to uniformly heat the object to be processed such as a panel (dry or burned). Cheng et al.). In addition, heat treatment of a metal product, heat treatment of a coating film formed on a substrate having various shapes, and a film can be appropriately performed. Specifically, it can be used for heat treatment of coating films (filter constituent materials) for flat panel displays, coating and drying of coated metal products, automobile-related products, woodwork products, etc., electrostatic flocking followed by drying, and plastic processing products. Heat treatment, solder reflow of printed circuit boards, printing drying of thick film integrated circuits, etc.

(2) Fixing device

The fixing device provided with the heater can be configured to be appropriately selected by a heating target, a fixing means, or the like. For example, a fixing means with pressure bonding is provided. When toner or the like is fixed on a recording medium such as paper, or when a plurality of members are pasted, it can be formed with a heating section with a heater and a pressure section. Hold the device. Of course, it can also be set as a fixing means without accompanying crimping | compression-bonding. In the present invention, it is preferable that an unfixed image including toner formed on the surface of a recording medium such as paper or film is fixed to the fixing device 5 of the recording medium.

FIG. 13 shows the main parts of the fixing device 5 arranged in the electrophotographic image forming apparatus. The fixing device 5 includes a rotatable fixing roller 51 and a rotatable pressure roller 54. The heater 1 is arranged inside the fixing roller 51. The heater 1 is preferably disposed so as to be close to the inner surface of the roller 51.

The heater 1 may be formed, for example, as the fixing means 5 shown in FIG. 15, and may be fixed to a material made of a material that can conduct heat emitted from the heater 1. The inside of the heater holder 53 is a structure that transmits the heat of the heater 1 from the inside to the outer surface of the fixing drum 51.

FIG. 14 also shows a main part of the fixing device 5 provided in the electrophotographic image forming apparatus. The fixing device 5 includes a rotatable fixing roller 51 and a rotatable pressure roller 54. A heater for transferring heat to the fixing roller 51 is disposed inside the fixing roller 51. 1. A pressure roller 52 for pressure-contacting the recording medium together with the pressure roller 54. The heater 1 is arranged along the cylindrical surface of the fixing drum 51.

In the fixing device 5 shown in FIG. 13 or FIG. 14, a voltage is applied from a power supply device (not shown), thereby heating the heater 1, and the heat is transmitted to the fixing roller 51. Next, when a recording medium having an unfixed toner image on its surface is supplied between the fixing roller 51 and the pressure roller 54, the crimping portion of the fixing roller 51 and the pressure roller 54 is provided. The toner melts to form a standing portrait. Since the fixing roller 51 and the pressure roller 54 have crimping portions, they rotate together. As described above, since the heater 1 suppresses a local temperature rise that is likely to occur when a small recording medium is used, the temperature unevenness in the fixing roller 51 is unlikely to occur, and the fixing can be performed uniformly.

In other aspects including the fixing device of the heater 1, it may be formed as a mold having an upper mold and a lower mold, and 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 an image forming device such as an electrophotographic printing machine or a photocopier, and is installed in a household electric device. It is suitable as a heat source for heating, heat preservation, etc.

[3] Image forming device

The image forming apparatus provided with the heater can be formed into a structure appropriately selected depending on the heating target, the heating purpose, and the like. In the present invention, as shown in FIG. 15, it is preferable to include imaging means for forming an unfixed image on the surface of a recording medium such as paper or film, and fixing means 5 for immobilizing the unfixed image on the recording medium. The fixing means 5 includes an image forming apparatus 4 of the heater 1. The image forming apparatus 4 may be configured to include a recording medium transporting means or a control means for controlling each means in addition to the above means.

FIG. 15 is a schematic view showing a main part of an image forming apparatus 4 of an electrophotographic method. The imaging means may be any of a method including a transfer drum and a method without a transfer drum, and FIG. 15 shows a state with a transfer drum.

In the imaging means, the charged processing surface of the photoconductor drum 44 which is charged to a predetermined potential by the charging device 43 while rotating is irradiated with the laser output from the laser scanner 41, and the developing device 45 of the supplied toner forms an electrostatic latent image. Next, a toner image is transferred onto the surface of the transfer drum 46 linked to the photoreceptor drum 44 using the potential difference. Thereafter, a toner image is transferred on the surface of the recording medium supplied between the transfer drum 46 and the transfer drum 47 to obtain a recording medium having an undefined image. Toner is a particle containing a binder resin, a colorant, and additives. The melting temperature of the bonding resin is usually 90 ℃ ~ 220 ℃. Among them, a cleaning device may be provided on the surface of the photoreceptor drum 44 and the transfer drum 46 to remove insoluble toner and the like.

The fixing means 5 can be formed in the same configuration as the above-mentioned fixing device 5, and includes a pressure roller 54 and a heater holder 53 provided with a heater 1 for holding the paper-feeding-direction heater 1 therein. The fixing roller 51 is interlocked with the pressure roller 54. A recording medium having an unfixed image from an image forming means is supplied between the fixing roller 51 and the pressure roller 54. The toner image of the recording medium is fused by the heat of the stationary roller 51. The molten toner is pressed at the pressure contact portion between the stationary roller 51 and the pressing roller 54, and the toner image is fixed. Recording media. Instead of the fixing roller 51, the fixing means 5 of FIG. 15 may be equipped with the fixing belt which arrange | positions the heater 1 close.

Generally, the temperature of the fixing roller 51 is uneven, and if the amount of heat supplied to the toner is too small, the toner is peeled off from the recording medium. On the other hand, if the amount of heat is excessive, the toner is peeled. It may be attached to the fixing roller 51, and the fixing roller 51 may be wound once and then attached to the recording medium. Since the fixing means 5 provided with the heater of the present invention is quickly adjusted to a predetermined temperature, it is possible to suppress a defect.

The image forming apparatus of the present invention is used to suppress excessive temperature rise in a non-paper-passing area during use, and is suitable as an electrophotographic printing machine, a photocopier, and the like.

〔4〕 Heating device

The heating device provided with this heater can be formed into a structure suitably selected by the size, shape, etc. of a heating target. In the present invention, for example, it is configured to include a frame body portion, a closable window portion provided for taking out and placing a heat-treated object, and movable heating provided inside the frame body portion.器 部。 The department. If necessary, the inside of the frame body can be equipped with: a heat-treated object setting part for arranging the heat-treated object; if the gas is exhausted by heating the heat-treated object, an exhaust part that exhausts the gas; A pressure adjustment unit such as a vacuum pump such as the internal pressure of the unit. The heating system may be performed while the object to be heat-treated and the heater portion are fixed, or may be performed while moving either one.

This heating device is suitable as a device for drying a heat-treated object containing water, an organic solvent, and the like at a desired temperature. Next, it can be used as a vacuum dryer (decompression dryer), a pressure dryer, a dehumidifier dryer, a hot-air dryer, an explosion-proof dryer, and the like. In addition, it is suitable as a device for firing unfired materials such as LCD panels and organic EL panels at a desired temperature. Next, it can be used as a reduced pressure baking machine, a pressure baking machine, and the like.

[5] Manufacturing method of heater

As described above, the manufacturing method of the heater (1) provided with the plurality of heat generating portions (10) arranged on the base body (11) can be configured to include a power supply wiring forming process using a conductive material, Form two power supply wirings that are separated for each heating part (10) and separated from each other (13 (13a, 13b)); a resistance heating wiring formation process, which is formed in each heating section (10), using a resistance heating material to connect the power supply wirings (13a, 13b) ( 12); measurement process, after forming the power supply wiring (13) and the resistance heating wiring (12), measuring the power supply wiring (13a, 13b) for each heating portion (10) by means of resistance value measurement means Resistance value; calculation engineering, which uses calculation means to compare the resistance value measured by the measurement process with a predetermined range for each heating part (10), if the resistance value exceeds the predetermined value In the range, the length of the resistance heating wiring (12) that is substantially shortened in order to correct the resistance value to the aforementioned predetermined range is determined as the correction length; the bridge formation process is to correct the resistance heating wiring (12). The method of shortening the length of the aforementioned length is to form a conductive material between the two points of the resistance heating wiring (12) and the one point of the resistance heating wiring (12) and the power supply wiring (13). At least 1 correction span connected to at least 1 Bridge (14); and a bridge forming process for power supply, which is formed by connecting one of the power supply wirings (13a) and the other power supply wiring (13b) of each heating portion (10) to each other through a conductive material. Power supply bridge (15).

Hereinafter, each of the aforementioned processes will be described with reference to FIG. 16. However, in the following description, the details of the heater 1 and its respective parts are the same as those of the above-mentioned [1], and are therefore omitted.

(1) Wiring formation process for power supply

A pattern of the power supply wirings 13 (13a, 13b) of all the heat generating portions 10 shown in FIG. 16 (a) is formed on the base 11 using a conductive material. The pattern of the power supply wiring 13 is not limited. For example, as shown in FIG. 1, in each heating portion 10, one of the power supply wirings 13 a may be formed on one end portion of the base 11, and the other power supply wiring 13 b may be formed. The other end portion is formed on the base body 11. The conductive materials used are as described above. The conductive material is printed on the substrate 11 and fired, whereby the aforementioned pattern can be formed. The power supply wiring 13 may be provided with an island portion for measuring the resistance value of each of the heat generating portions 10 later as necessary.

(2) Resistive heating wiring formation process

On the base body 11, a pattern of the resistance heating wires 12 of all the heating portions 10 shown in FIG. 16 (b) is formed using a resistance heating material. The resistance heating material used is a conductive material whose resistance value can be changed depending on the temperature. The resistive heat-generating material is printed on the substrate 11 and fired, whereby the aforementioned pattern can be formed. From the viewpoint of area specific resistance, the thickness of the resistance heating wire 12 is preferably 3 to 20 μm.

Either the resistance heating wiring formation process or the power supply wiring formation process may be performed first. In a portion where the wiring formed first and the wiring formed later are laminated, the resistance heating wiring 12 is electrically connected to the aforementioned power supply wiring 13.

(3) Measurement Engineering

After forming the power supply wiring 13 and the resistance heating wiring 12, In the predetermined process, the resistance value between the two power supply wirings (13a, 13b) is measured for each heating portion 10 by a resistance value measuring means for measuring the resistance value. The resistance value and the temperature coefficient of resistance can be formed to be measured in accordance with JIS C2526. The specific configuration of the resistance value measuring means is not limited. The measured resistance value is transmitted to the next calculation means.

(4) Computing Engineering

The calculation engineering compares the resistance value of the resistance heating wire 12 measured by the measurement process with a predetermined range for each heating portion 10 by a calculation means. If the resistance value exceeds the predetermined range, in order to This resistance value correction is performed within the aforementioned predetermined range, and a process for calculating a substantially shortened length (correction length L) of the resistance heating wire 12 is obtained. The computing means can be constructed using a computer. The calculation means may be configured so as to input the resistance values of all the heating parts 10 measured in the aforementioned measurement process.

The aforementioned "predetermined range" can be arbitrarily set. For example, a predetermined resistance value can be used as a reference to form a range of a certain ratio (for example, 0.95 to 1.05). In addition, among the resistance values measured for all the heating parts 10, the minimum resistance value may be used as a reference, and may be formed in a range of a certain ratio (for example, 1.00 to 1.05). The heating portion 10 having a resistance value measured outside a predetermined range (for example, 1.05 times the resistance value as a reference) is measured at a predetermined ratio (for example, 1.00) to the resistance value formed as the reference. The resistance value within ~ 1.05) can be calculated by calculating the length L in which the resistance heating wire 12 is substantially shortened. The calculation method is not particularly limited, such as Cogan The correction length L is calculated from the resistivity of the resistance heating material and the width and thickness of the wiring. If the resistance value of the resistance heating wire 12 is within a predetermined range, the heating section 10 may be set without a correction bridge 14.

In addition, the calculation means may be configured such that the length of the resistance heating wiring 12 is substantially shortened by the length of the resistance heating wiring 12 based on the calculated correction length L and the wiring pattern of the resistance heating wiring 12 for each heating unit 10. , The position where one or more correction bridges 14 are formed is calculated.

In addition, the calculation means may be configured to transmit data such as the correction length L calculated for each heating unit 10 or the position of the correction bridge 14 to be set to the subsequent correction bridge formation process.

(5) Correction of bridge formation project

The correction bridge formation engineering system is to form a correction span of 1 or more for each heating part 10 by shortening the length of the resistance heating wire 12 by the length of the resistance heating wiring 12 based on the data such as the correction length L obtained through computational engineering. Construction of bridge 14. The correction bridge 14 connects at least one of two points between the resistance heating wire 12 and one point between the resistance heating wire 12 and the power supply wiring 13. The correction bridge 14 is formed using a conductive material. Therefore, the aforementioned section connected by the correction bridge 14 is electrically short-circuited. The correction span bridge 14 can form a complex number. If the connection interval caused by each correction span bridge 14 is matched, the length of the resistance heating wiring 12 can be shortened by the length of the correction length L.

The location where the correction bridge 14 is provided is not particularly limited. For example, as shown in FIG. 4 (a), at least one correction bridge 141 may be provided so as to connect one point of the resistance heating wiring 12 and the power supply wiring 13 b. In addition, as shown in the figure (b), at least one correction bridge 143 can be provided so as to connect the lines of the resistance heating wiring 12. In addition, as shown in the figure (c), at least one correction bridge 144 may be provided so as to overlap on the line of the resistance heating wire 12. In addition, as shown in the figure (d), at least two correction bridges 142 can connect the points having the same length at each end of the resistance heating wire 12 and the power supply wirings (13a, 13b) on each end side. By the way.

As shown in FIG. 16 (c), on the base 11 on which the resistance heating wiring 12 and the power supply wiring 13 are formed, a correction bridge 14 is formed in each of the heating portions 10 at the positions set as described above. The conductive material used is preferably a conductive paste such as silver. This conductive material is printed and fired so as to be laminated on the resistance heating wiring 12 and the power supply wiring 13, thereby providing a correction bridge 14.

(6) Cross-bridge formation project for power supply

In the power supply bridge forming process, a power supply bridge 15 is formed in which one of the power supply wirings 13 a and the other power supply wiring 13 b of each of the heat generating portions 10 are connected to each other by a conductive material.

As shown in FIG. 16 (d), a 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 such as silver. will This conductive material is printed on the base body 11 on which the resistance heating wiring 12, the power supply wiring 13, and the correction bridge 14 are formed, and is fired to provide a power supply bridge 15.

Among them, the power supply bridge 15 may be formed simultaneously with the correction bridge 14.

As shown in FIG. 8, the heater 1 is configured to scan at least one of the heated object 2 and the heater 1 in a predetermined scanning direction D in a state facing the heated object 2 to be heated. When the heating means 2 is used. In the heater 1 as described above, each of the heat generating portions 10 is preferably arranged in a direction orthogonal to the scanning direction D. Next, through the resistance heating wiring formation process, in each heating portion 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 aforementioned orthogonal direction.

In addition, the heater 1 used as described above is preferably formed so that the cross-sectional shape of the base body 11 in the scanning direction D is centered on an axis orthogonal to the scanning direction D and placed on the side opposite to the object 2 to be heated. A convex arc shape (see FIGS. 10 and 11). Next, each heat-generating part 10 is preferably disposed on the convex surface or a surface on the opposite side thereof. However, if the heating surface of the heater 1 is formed as a curved surface that is a part of a cylinder as described above, the thickness or line width of the resistance heating wiring 12 will be uneven by general printing techniques. It is difficult to form the resistance heating wiring 12 in the entire heater 1 with high accuracy. With the method of manufacturing the heater, after the resistance heating wiring 12 is formed, only the correction bridge 14 is provided to correct the resistance value, and uniform heating characteristics can be obtained throughout the heating surface of the heater 1.

[6] Effects of this heater

In the embodiment, the heater 1 shown in FIG. 17 is manufactured 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 was provided on the surface of the substrate 11. The base body 11 is provided with a heat generating area 100 having a length of 15 mm and a width of 315 mm. The heat generating area 100 is provided with 20 heat generating portions 10 in a horizontal direction by a wiring pattern as shown in FIGS. 1 and 5.

The resistance heating wiring of each heating portion 10 is formed by printing the wiring of the aforementioned pattern using a paste containing silver-palladium without containing lead, cadmium, and nickel, and firing it at 850 ° C. The resistance heating wiring is printed with a line width of 0.8 mm and a thickness of 10 μm as a reference.

In addition, the power supply wiring of each heat generating portion 10 is formed by printing using a silver paste and then firing at 850 ° C.

After the resistance heating wiring and the power supply wiring are formed, the resistance value of the resistance heating wiring of each heating section 10 is measured. Next, for the heating part whose resistance value exceeds a certain value, in order to form the resistance value to the above-mentioned constant value, the length of the resistance heating wiring is substantially shortened (corrected length), and set at both ends of the resistance heating wiring. The position of the correction bridge is provided between the power supply wiring and the power supply wiring. The correction bridge system is formed by printing with a silver paste at the previously set position for each heating part, and firing at 850 ° C.

Next, the power supply wirings of the heating sections are connected to each other. The bridge system for power supply is formed by printing at 850 ° C after printing with silver paste.

After the above processes, a protective layer using crystallized glass to cover the entire wiring portion on the substrate and an overcoat layer using amorphous glass were provided to obtain the heater 1 of the example.

In addition, the heater formed as a comparative example was manufactured by the same manufacturing process as above except that the above-mentioned correction bridge was not provided.

In FIG. 18, (a) the heater 1 of the example (supply voltage: about 30 V), and (b) the heater of the comparative example (supply voltage: about 28 V). The vertical axis of the graph is temperature, and the horizontal axis x corresponds to the lateral position of the heat generating region shown in FIG. 17.

The heater of the comparative example does not correct the resistance value, and therefore, as shown in (b) of this figure, the temperature distribution in the lateral direction of the heat generating region 100 changes. On the other hand, the heater 1 of the embodiment is provided with a correction bridge that corrects the resistance value of each heating portion 10. Therefore, it can be seen from the figure (a) that the lateral temperature distribution of the heating region 100 is uniformized.

However, the present invention is not limited to those shown in the specific embodiments described above, and various modifications can be made within the scope of the present invention in accordance with the purpose and application.

Claims (13)

A heater comprising a plurality of heat generating portions arranged on a base body, the heater comprising: two power supply wirings, which are provided for each of the heat generating portions and separated from each other. It is made of a conductive material; a resistance heating wire is provided in each of the foregoing heating portions, and includes a plurality of main pattern portions and a connection pattern portion in which each of the main pattern portions is connected in series to use a resistance heating material, Connect each of the aforementioned power supply wirings in a manner of being connected; 1 or more of the correction span bridge is for each of the aforementioned heating portions, and if the resistance value between the two ends of the aforementioned resistance heating wiring measured after the aforementioned wiring exceeds a predetermined range At that time, one point of the resistance heating wiring and the power supply wiring are connected by a conductive material; and a power supply bridge is a conductive material that connects one of the heating portions to the power supply by a conductive material. The wirings are connected to each other, and the other aforementioned power supply wirings are connected to each other through a conductive material. For example, in the heater of the first scope of the patent application, at least two of the aforementioned correction span bridge systems are connected to each other by a point having the same length at each end of the resistance heating wiring and the power supply wiring at each end side. For example, if the heater of the first or the second item of the patent application scope is to scan at least one of the object to be heated and the heater in a predetermined scanning direction in a state facing the object to be heated, In the heater for heating the object to be heated, each of the heat generating sections is arranged in a direction orthogonal to the scanning direction. In each of the heat generating sections, the resistance heating wiring is provided with respect to the orthogonal direction. A plurality of main pattern portions provided at angles within a predetermined range. For example, the heater of claim 3, wherein the cross-sectional shape of the substrate along the scanning direction is centered on an axis orthogonal to the scanning direction, and is convex on the side opposite to the object to be heated. Each of the heating portions is arranged on the convex surface or a surface opposite to the convex surface. For example, the heater of the first or second item of the patent application scope, wherein the aforementioned resistance heating material is a conductive material whose resistance value changes depending on the temperature, and the conductive material used for the aforementioned correction bridge and the aforementioned power supply bridge is electrically conductive. Sexual paste. A fixing device is characterized in that it is provided with a heater as in item 1 or item 2 of the scope of patent application. A device for forming an image, which is characterized by being provided with a heater such as the first or second item in the scope of patent application. A heating device is characterized in that it is provided with a heater such as item 1 or item 2 of the scope of patent application. A manufacturing method of a heater, which is a manufacturing method of a heater having a plurality of heat generating portions arranged on a base, and is characterized in that it includes: a wiring forming process for power supply, which uses a conductive material, Two heating wires for power supply which are separated from each other and separated from each other; a resistance heating wiring forming process, wherein each of the heating sections includes a plurality of main pattern sections, and each of the main pattern sections is connected in series; The connection pattern part uses resistance heating materials to form a resistance heating wiring by connecting the power supply wirings. The measurement process is after forming the power supply wiring and the resistance heating wiring, and then using resistance measurement methods, For each of the heat-generating parts, the resistance value between the power-supply wirings is measured. For the calculation process, for each of the heat-generating parts, the resistance value and the predetermined range measured by the measurement process are calculated for the heat-generating parts. For comparison, if the resistance value exceeds the predetermined range, determine whether to correct the resistance value to the predetermined range. The substantially shortened length of the resistance heating wiring is used as a correction length. The correction bridge forming process is to shorten the length of the resistance heating wiring by a portion of the correction length, and form a conductive material to heat the resistance. One or more correction bridges connected between one point of the wiring and the power supply wiring; and a power supply bridge formation process that forms one of the power supply wirings of one of the heat generating sections with each other by using a conductive material. A power supply bridge that is connected to each other and connects the other power supply wirings to each other through a conductive material. For example, the method for manufacturing a heater in the ninth scope of the patent application, in which, by the aforementioned bridge forming process for correction, at least two points of the correction bridge are formed so that each end of the heating wire heated by the resistor is a point of the same length, and each The end-side power supply wirings are formed so as to be connected to each other. For example, in the method for manufacturing a heater in the ninth or tenth of the scope of application for a patent, in a state in which the object to be heated faces the object, at least one of the object to be heated and the heater is scanned toward a predetermined scan. Directional scanning, a method of manufacturing a heater for heating the object to be heated, each of the heating parts is arranged in a direction orthogonal to the scanning direction, and through the resistance heating wiring forming process, in each of the heating parts, The resistance heating wiring is formed by including a plurality of main pattern portions provided at an angle within a predetermined range with respect to the orthogonal direction. For example, the method for manufacturing a heater according to item 11 of the patent application, wherein the cross-sectional shape of the substrate along the scanning direction is centered on an axis orthogonal to the scanning direction and on the side opposite to the object to be heated. Each of the heat generating portions has a convex arc shape and is disposed on the convex surface or a surface on the opposite side thereof. For example, the method for manufacturing a heater of the 9th or 10th in the scope of patent application, wherein the aforementioned resistance heating material is a conductive material whose resistance value changes depending on the temperature, and the conduction used in the aforementioned correction bridge and the aforementioned power supply bridge The material is a conductive paste.