JP2011003429A - Planar heating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planar heating element having an opening that is excellent in positional accuracy.SOLUTION: The planar heating element includes: an electrical insulating base 1; feeder electrodes 2a, 2b that are formed facing each other on the base 1 by means of screen printing and that allow comb-shaped connection electrodes 5a, 5b to be alternately branched therefrom; and a high molecular resistor 3 being subjected to screen printing with overlying the feeder electrodes 2a, 2b, wherein a part in which the feeder electrodes 2a, 2b of the base 1 and the high molecular resistor 3 do not exist is subjected to markings 9, 10 for forming opening parts, and the opening parts 7, 8 are formed according to the markings 9, 10.

Description

  The present invention relates to a thin and long planar heating element, and more particularly to a pattern configuration of electrodes and resistors.

  3 and 4 show a conventional planar heating element, which is a power supply electrode having a pair of comb-shaped connection electrodes 52a and 53b by printing and drying a conductive paste on an electrically insulating base material 51 such as a polyester sheet. 52 and 53 are formed, and a polymer resistor ink is printed and dried at a position to which power is supplied by the connection electrodes 52a and 53b to provide a polymer resistor 54. Further, a coating of the same material as that of the substrate 51 is provided. The connection electrode 52, 53 and the polymer resistor 54 are covered and protected with a material 55.

  When a polyester film is used as the base material 51 and the covering material 55, for example, a polyethylene-based heat-fusible resin 56 is bonded to the covering material 55 in advance, and the base material 51 and the covering material 55 are covered by pressurizing when hot. The material 55 is joined via the heat-fusible resin 56.

  As a result, the connection electrodes 52a and 53b and the polymer resistor 54 are isolated from the outside world and given long-term reliability.

  As a means for pressurization at the time described above, a laminator 59 composed of two heating rolls 57 and 58 is generally used as shown in FIG.

  The PTC characteristic means a resistance temperature characteristic (Positive Temperature Coefficient) in which the resistance value increases as the temperature rises, and the resistance value increases rapidly when a certain temperature is reached. The polymer resistor 54 having the PTC characteristic is A planar heating element having a self-temperature adjusting function can be provided (see, for example, Patent Documents 1, 2, and 3).

  In addition, a plurality of small through holes are distributed throughout the planar heating element in order to improve the flexibility of the planar heating element by providing openings (see, for example, Patent Document 4). ).

Japanese Patent Laid-Open No. 56-13689 JP-A-6-96843 JP-A-8-120182 JP 2008-21545 A

  In order to improve the flexibility of the planar heating element, the above-described conventional device in which a plurality of small through holes are distributed over the whole still solves the technical problem of distributing the plurality of small through holes over the whole. There is no current situation, and there is a problem of further improving the positional accuracy.

  In view of the above-described problems of the conventional technology, the problem to be solved by the present invention is to provide a planar heating element having an opening with excellent positional accuracy.

  In order to achieve the above object, the present invention provides an electrically insulating base material, a power supply electrode that is disposed oppositely on the base material by screen printing, and alternately branches a comb-shaped connection electrode, and the power supply electrode. And a molecular resistor that is screen-printed on the substrate, and an opening is formed in a portion of the substrate where the feeding electrode and the polymer resistor are not present.

  According to the present invention, an opening having excellent positional accuracy can be formed, so that the planar heating element can be easily and simply attached to a frame member or the like.

The top view of the planar heating element in Embodiment 1 of this invention The top view of the planar heating element in Embodiment 2 of this invention Plan view of a conventional planar heating element XY cross section of FIG. Manufacturing explanatory diagram of coplanar heating element

  According to a first aspect of the present invention, there is provided an electrically insulative base material, a power supply electrode arranged on the base material so as to face each other by screen printing, and alternately branching a comb-shaped connection electrode, and a screen superimposed on the power supply electrode. A printed polymer resistor was provided, and a mark for forming an opening was formed on a portion of the substrate where the feeding electrode and the polymer resistor were not present, and an opening was formed according to the marking.

  Thereby, it becomes possible to form according to an opening part, the positional accuracy of the opening part in a planar heating element improves, and the attachment to the frame material of a planar heating element can be performed easily and simply. .

  According to a second invention, in the first invention, the marking is performed by printing simultaneously with the screen printing of the feeding electrode and the polymer resistor.

  Thereby, the positional accuracy from the outer shape to the opening is improved. As for the positional accuracy of the opening, since the distance from the outer shape is important when mounting to the mounted portion, the mounting accuracy can be improved by improving the positional accuracy.

  According to a third invention, in the first invention, openings having a plurality of shapes are formed.

  As a result, the substantially central opening can be set as a reference position such as a screw, and the distance tolerance to the end can be reduced, thereby providing improved attachment. In particular, in the case of a relatively long sheet heating element used for floor heating or the like, the dimensional tolerance of the outer shape also becomes large, but the frame material is provided by regulating the positional deviation of the opening with the opening at the substantially center as the reference position. And the distance tolerance between the outer edge of the planar heating element can be reduced.

  In a fourth aspect based on the first aspect, the opening is set to a rectangle having a rounded corner.

  Thereby, even when the material which the electrical insulating base material is easy to tear is used, the stress is not concentrated on the R-shaped portion, so that the tearing from the opening can be prevented.

  In addition, since the opening is rectangular, it is easy to provide a relatively large opening, and the vertical and horizontal positioning accuracy can be increased.

(Embodiment 1)
In FIG. 1, a plurality of pairs of power supply electrodes 2a, 2b and a power supply electrode 2a, 2b are electrically connected to a pair of power supply electrodes 2a, 2b on an electrically insulating substrate 1 such as a polyester film to form a surface. A heating element 4 is formed.

  The power supply electrodes 2a and 2b have a comb-teeth shape in which a plurality of connection electrodes 5a and 5b are branched toward the opposite electrode, and are formed by screen printing silver paste and drying.

  The polymer resistor 3 is a polymer resistor ink in which a polymer resistor material in which carbon is kneaded in a resin is dissolved in a solvent, or a polymer resistor material in which carbon is kneaded in a crystalline resin. It is formed by using what is dissolved in, and printing and drying.

  As the printing of the feeding electrodes 2a and 2b branched from the connecting electrodes 5a and 5b and the polymer resistor 3, the electrically insulating base material 1 is sent out by Roll-to-Roll and is wound at a predetermined distance by equipment capable of winding. A method of performing screen printing while moving is common.

  By repeatedly printing the power supply electrodes 2a and 2b, the connection electrodes 5a and 5b, and the polymer resistor 3, it is possible to form the long planar heating element 4.

  In the base material 1, marking lines 9 and 10 are formed in the printing plate of the connection electrodes 5a and 5b to form the outer shape line 6 and the openings 7 and 8 indicating the outer shape, and simultaneously with the connection electrodes 5a and 5b. It is configured to be printed.

  Although not shown in FIG. 1, an electrical insulating covering material provided with fixing means such as hot melt or adhesive material is attached to the entire electrically insulating base material 1 in order to ensure insulation of the sheet heating element 4. Is common.

  As a method of forming the openings 7 and 8, there are a method of punching with Thomson or the like, a method of burning the substrate 1 with a laser or the like, and the markings 9 and 10 are used for positioning in any method.

  After all the printing is completed, the electrically insulating base material 1 is cut along the outline 6 to form the openings 7 and 8, thereby forming the planar heating element 4 having a predetermined length shape. It becomes.

  Furthermore, the power supply electrodes 2a and 2b are completed by attaching power supply means such as terminals and lead wires, respectively.

  Next, the operation and action will be described.

  In FIG. 1, the opening 8 is substantially circular, the opening 7 is substantially oval, and the area of the opening 8 is smaller than that of the opening 7.

  Thus, when the planar heating element 4 is attached to a panel such as floor heating or a moat kotatsu, the opening 8 can be used as a reference hole, leading to an improvement in attachment.

  The opening 8 is positioned substantially in the center in the length direction in the planar heating element 4. The substantially central opening can be used as a reference position such as a screw, and the distance tolerance to the end can be reduced, so that the mounting property is improved.

  In particular, in the case of a relatively long sheet heating element used for floor heating or the like, the dimensional tolerance of the outer shape in the length direction also increases. However, the positional deviation is regulated by using the substantially central opening 8 as a reference position. Thus, the distance tolerance between the attached portion such as the frame member and the outer end portion of the planar heating element 4 can be reduced to about half when the frame member is attached to the frame member or the like with reference to the end surface of the planar heating element 4.

  Of course, reducing the mounting tolerance can reduce the area of the openings 7 and 8. That is, since the non-heat generating portion can be reduced, it goes without saying that the planar heating element 4 having a good heat generation distribution can be obtained.

  The openings 7 and 8 are in positions where none of the power supply electrodes 2a and 2b, the connection electrodes 5a and 5b, and the polymer resistor 3 are disposed.

  Thereby, the openings 7 and 8 can be disposed by the openings 7 and 8 without lowering the insulating property of the planar heating element 4.

  As a matter of course, since the markings 9 and 10 are not connected to any of the power supply electrodes 2a and 2b, the connection electrodes 5a and 5b, and the polymer resistor 4, the insulating properties are not lowered even if they are on the end face.

  The positioning markings 9 and 10 of the openings 7 and 8 and the marking 6 indicating the outer shape are printed simultaneously with the connection electrodes 2a and 2b.

  Thereby, since the openings 7 and 8 can be formed according to the positioning markings 9 and 10, not only the position accuracy at the time of drilling is improved, but also the position accuracy from the outer shape to the openings 7 and 8 is improved. To do.

  When attaching the planar heating element 4 to a frame member or the like, the outer shape is not only stored in a predetermined place but also attached to a place where the openings 7 and 8 are arranged in the frame member by a fixing means such as a screw. It is important to improve the distance accuracy between the openings 7 and 8.

  Note that the types of the outline 6 and the markings 9 and 10 are not limited to solid lines or dotted lines, and may be cross-shaped marks depending on circumstances.

(Embodiment 2)
FIG. 2 shows the second embodiment, and the same reference numerals are attached for convenience to those performing the same operations as in FIG. 1, and those of the first embodiment are used for specific description.

  The difference from FIG. 1 is that the opening 11 has a rectangular shape, and its corner portion is set in an R shape.

  The planar heating element 4 is attached by being sandwiched between frame members or the like, and the upper and lower frame members are fixed to each other by a fixing means such as an adhesive.

  At this time, the upper and lower frame members are in direct contact with each other at the rectangular opening 11.

  When the corner portion of the rectangular opening 11 is formed in an R shape, even if stress is applied to the electrically insulating substrate 2 during the manufacturing process or the like, tearing, tearing, and the like can be suppressed as much as possible.

The positional accuracy of the opening 11 can be referred to the positioning marking 12 printed on the same plate as the outline 6 and the connection electrodes 5a and 5b, so that the positional accuracy is improved and interference with fixing means such as screws attached to the frame material There is nothing to do.

  As described above, since the planar heating element according to the present invention can improve the positional accuracy of the openings of various shapes, the attachment to the attached portion becomes simple. Therefore, it is particularly useful for heating products such as floor heating and Horiza table that require high positional accuracy despite a relatively long sheet heating element.

DESCRIPTION OF SYMBOLS 1 Electrically insulating base material 2a, 2b Feed electrode 3 Polymer resistor 5a, 5b Connection electrode 6 Outline line 7, 8, 11 Opening 9, 10 Marking

Claims (4)

An electrically insulating base material, a power supply electrode which is arranged oppositely by screen printing on this base material, and alternately branches a comb-shaped connection electrode, and a polymer resistor which is screen-printed over the power supply electrode A sheet heating element in which an opening is formed on a portion of the substrate where the feeding electrode and the polymer resistor are not present, and an opening is formed in accordance with the marking. 2. The sheet heating element according to claim 1, wherein marking is performed by printing simultaneously with screen printing of the feeding electrode and the polymer resistor. The planar heating element according to claim 1, wherein openings having a plurality of shapes are formed. The planar heating element according to claim 1, wherein the opening is set to be a rectangle having a rounded corner.

Images