JP2010267560A - Surface heating element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface heating element capable of preventing: partial heating caused by a mutual printing gap between a resistor and a connection electrode for circuit connection; and generation of an area not contributing to heating. <P>SOLUTION: The electrode 2 and the resistor 3 are formed by printing on an insulating board 1, the electrode 2 is provided with a pair of primary electrodes 4, a plurality of branched electrodes 5 extending from respective primary electrodes to mating sides, and connection electrodes 6 numerously branched from the branched electrodes and formed by setting a pair at opposite positions of opposite potential electrodes. When a height dimension of the resistor formed by being electrically connected to the connection electrode is L1 and length of the connection electrode is L2, a relationship is set up to be L2>L1. Consequently, a range of current conduction connection straight line length to the resistor is not lessened even though a mutual position relationship is shifted at the time of printing of the resistor and the electrode, and thus, reduction of a calorific value and generation of temperature unevenness on the resistor can be restrained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sheet heating element used for, for example, an electric floor heating panel, an electric carpet, and the like, and in particular, a sheet heating element in which a current connecting electrode and a resistor as a heating material are formed by printing. The present invention relates to a pattern configuration of electrodes and resistors.

  Conventionally, in this type of planar heating element, an electrode formed on an electrically insulating substrate has a pair of parallel conductive bus bars and a so-called comb shape that extends in parallel from each bus bar at a distance from each other. The PTC conductive ink was printed in a striped pattern on it to form a resistor, and a heating region was formed between the conductive bus bars.

  The PTC conductive ink is made by adding a conductive material such as carbon black to an ethylene vinyl acetate copolymer resin and mixing it with a solvent (for example, see Patent Document 1).

  The PTC characteristic means a resistance-temperature characteristic in which the resistance value increases as the temperature rises, and when the temperature reaches a certain temperature, the resistance value rapidly increases. The PTC characteristic is composed of a resistor having a PTC characteristic. The heated region can provide a planar heating element having a self-temperature adjusting function.

  In addition, it is also possible to arrange a plurality of strip electrodes on an insulating substrate, and to dispose a heating resistor film separately with a space between the strip electrodes (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 3-129893 Japanese Utility Model Publication No. 57-186997

  In the conventional sheet heating element, in the resistor printed across the conductive bus and the branch electrode, the current value flowing through each part of the resistor is determined by the voltage value applied to each resistor. However, since a current flows directly from the conductive bus to the resistor, a voltage difference occurs at a position corresponding to the routing distance of the electrical bus.

  In addition, there is no problem as to which part of the resistor between the conductive bus bar and the branch electrode generates heat when the resistor does not have uneven printing in the resistor printing, but due to variations in printing conditions. Even if slight printing unevenness occurs, a portion where current easily flows and a portion where current does not easily flow are generated. This causes uneven heat generation temperature and includes a risk of causing abnormal overheating.

  In order to prevent abnormal heat generation in this resistor and prevent uneven heat distribution, the conductive busbar is not connected to the resistor, and further, there is no resistor straddling between the branch electrodes, and between the branch electrode phases. There are also proposals for printing resistors.

  However, in any case, since the electrode printing and the resistor printing cannot be performed simultaneously, the resistor printing is performed after the electrode printing, or the electrode printing is performed after the resistor printing. It will be.

  As a result, a deviation between the resistor and the electrode inevitably occurs, and uneven heating may occur due to variations in the effective energization length of the electrode connected to the resistor.

  The present invention solves such a conventional problem, and provides a planar heating element capable of generating uniform heat.

  In order to solve the above-described problems, the planar heating element of the present invention is formed by printing an electrode and a resistor on an electrically insulating substrate, and the electrode includes a pair of main electrodes and the main electrodes. Each of the plurality of branch electrodes extending to the other side, and a plurality of branch electrodes from these branch electrodes, and a connection electrode formed in pairs at opposite positions of the opposite potential electrode, are electrically connected to these connection electrodes. When the height dimension of the resistor formed by connection is L1, and the length L2 of the connection electrode, the relationship of L2> L1 is set.

  Therefore, even when the positional relationship between the resistor and the electrode is shifted during printing, the energization connection straight line length range to the resistor is not reduced.

  According to the planar heating element of the present invention, even if the mutual positional relationship between the electrode and the resistor is shifted due to printing, the energization range to the resistor is not reduced, so that the amount of heat generated by the resistor does not decrease. The temperature unevenness does not occur.

1 is a plan view of a part of a planar heating element showing Embodiment 1 of the present invention. Enlarged view of the main parts of the same heating element The principal part enlarged view of the planar heating element which shows Embodiment 2 of this invention The principal part enlarged view of the planar heating element which shows Embodiment 3 of this invention

  According to a first aspect of the present invention, an electrode and a resistor are formed on an electrically insulating substrate by printing. The electrode includes a pair of main electrodes and a plurality of branches extending from the main electrodes to the other side. The height of the resistor formed by the electrodes and the connection electrodes branched from the branch electrodes and formed in pairs at opposite positions of the opposite potential electrodes. When the dimension is L1 and the length L2 of the connection electrode, the relationship L2> L1 is set.

  According to a second aspect of the present invention, an electrode and a resistor are formed on an electrically insulating substrate by printing. The electrode includes a pair of main electrodes and a plurality of branches extending from the main electrodes to the other side. It consists of an electrode and a plurality of branches from these branch electrodes, formed in pairs at opposite positions of the opposite potential electrode, and having a connection electrode having a parallel part, and is electrically connected to the parallel part of these connection electrodes. When the width dimension of the resistor formed in this way is S1, and the width dimension S2 of the parallel portion of the connection electrode, the relationship of S2> S1 is set.

  According to a third aspect of the present invention, an electrode and a resistor are formed on an electrically insulating substrate by printing, and the electrode includes a pair of main electrodes and a plurality of branches extending from the main electrodes to the other side. It consists of an electrode and a plurality of branches from these branch electrodes, formed in pairs at opposite positions of the opposite potential electrode, and having a connection electrode having a parallel part, and is electrically connected to the parallel part of these connection electrodes. When the width dimension of the resistor formed in this manner is S1, and the width dimension S2 of the parallel portion of the connection electrode, the relationship of S1> S2 is set.

  Therefore, even when the positional relationship between the resistor and the electrode is shifted, the range of the length of the current-carrying connection to the resistor is not reduced, which reduces the amount of heat generated by the resistor and causes uneven temperature. Occurrence can be suppressed.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that the embodiments described below do not limit the present invention.

(Embodiment 1)
1 and 2, a power supply electrode 2 formed by printing and drying a silver paste on an electrically insulating substrate 1 such as a polyester film, and a resistor formed by printing and drying a polymer resistor ink. 3 is provided.

  The electrode 2 protrudes from the pair of main electrodes 4 located on both sides of the substrate 1 toward the other side so as to form a plurality of branch electrodes 5 in a comb shape. 6 is formed toward the opposite branch electrode 5.

  And the resistor 3 is formed in the parallelogram in the opposing connection electrode 6 related to an opposite electric potential electrode.

  Here, when the height dimension of the resistor 3 is L1 and the length dimension L2 of the connection electrode 6 is set, the relationship of L2> L1 is set.

  As the polymer resistor ink, a polymer resistor in which carbon is kneaded in a resin is dissolved in a solvent, or a polymer resistor in which carbon is kneaded in a crystalline resin is dissolved in a solvent. ing.

  1A shows a normal printing state, and FIGS. 1B and 1C show a state in which there is a printing misalignment between the connection electrode 6 and the resistor 3.

  In any case, there is no place in the resistor 3 where the energized current is concentrated, or there is no region of the resistor 3 that does not contribute to heat generation. From this, the parallelogram shape of the resistor 3 is not generated. It is possible to realize a state in which no heat generation unevenness occurs.

(Embodiment 2)
In FIG. 3, a power feeding electrode formed by printing and drying a silver paste and a resistor 11 formed by printing and drying a polymer resistor ink are provided on an electrically insulating substrate such as a polyester film. It is.

  The electrodes protrude from the pair of main electrodes located on both sides of the substrate toward the mating side so as to form a plurality of branch electrodes 12 in a comb shape, and further, a plurality of L-shaped strips are formed from the branch electrodes 12. The connection electrode 13 is branched.

  And the resistor 11 is formed in the parallelogram in the parallel site | part 13a of the connection electrode 13 which opposes in relation to an opposite potential electrode.

  Here, when the width dimension of the resistor 11 is S1, and the width dimension S2 of the parallel portion 13a of the connection electrode 13, the relationship of S2> S1 is set.

  3A shows a normal printing state, and FIGS. 3B and 3C show a state in which there is a printing misalignment between the connection electrode 13 and the resistor 11. FIG.

  In any case, there is no place where the energized current is concentrated in the resistor 11, or there is no region of the resistor 11 that does not contribute to heat generation. From this, the parallelogram shape of the resistor 11 is not generated. It is possible to realize a state in which no heat generation unevenness occurs.

(Embodiment 3)
In FIG. 4, a power supply electrode formed by printing and drying a silver paste and a resistor 21 formed by printing and drying a polymer resistor ink are provided on an electrically insulating substrate such as a polyester film. It is.

  The electrodes protrude from the pair of main electrodes located on both sides of the substrate toward the other side so as to form a plurality of branch electrodes 22 in a comb shape, and further, a plurality of L-shaped strips are formed from the branch electrodes 22. The connection electrode 23 is branched.

  And the resistor 21 is formed in the parallelogram in the parallel site | part 23a of the opposing connection electrode 23 related to an opposite electric potential electrode.

  Here, when the width dimension of the resistor 21 is S1, and the width dimension S2 of the parallel portion 23a of the connection electrode 23, the relationship of S1> S2 is set.

  4A shows a normal printing state, and FIGS. 4B and 4C show a state in which there is a printing misalignment between the connection electrode 23 and the resistor 21. FIG.

  In any case, there is no place where the energizing current is concentrated in the resistor 21, or there is no region of the resistor 21 that does not contribute to heat generation. From this, the parallelogram shape of the resistor 21 is not generated. It is possible to realize a state in which no heat generation unevenness occurs.

  As described above, the sheet heating element according to the present invention causes local abnormal heat generation to the heating resistor even if the resistor has a positional deviation within an allowable range that can be set in advance in the mutual printing positional relationship with the connection electrode. It is possible to prevent the occurrence of heat generation unevenness due to the occurrence of a portion that does not contribute to heat generation, so that the resistor is not limited to heating products such as floor heating panels and electric carpets. The present invention can be applied to all the heating elements formed and provided with the power supply electrode.

DESCRIPTION OF SYMBOLS 1 Base | substrate 2 Electrode 3,11,21 Resistor 4 Main electrode 5,12,22 Branch electrode 6,13,23 Connection electrode 13a, 23a Parallel part

Claims (3)

An electrode and a resistor are formed on an electrically insulating substrate by printing. The electrodes include a pair of main electrodes, a plurality of branch electrodes extending from the main electrodes to the other side, and the branch electrodes. And a connection electrode formed in pairs at opposite positions of the opposite potential electrode. The height dimension of the resistor formed by electrical connection to these connection electrodes is L1, and the connection A planar heating element having a relationship of L2> L1 when the electrode length is L2. An electrode and a resistor are formed on an electrically insulating substrate by printing. The electrodes include a pair of main electrodes, a plurality of branch electrodes extending from the main electrodes to the other side, and the branch electrodes. The resistor is formed by connecting a plurality of branch electrodes to the opposite positions of the opposite-potential electrode and forming a pair, and connecting electrodes having parallel portions, and electrically connected to the parallel portions of the connection electrodes. A planar heating element having a relationship of S2> S1, where S1 is the width dimension S2 and the width dimension S2 of the parallel portion of the connection electrode. An electrode and a resistor are formed on an electrically insulating substrate by printing. The electrodes include a pair of main electrodes, a plurality of branch electrodes extending from the main electrodes to the other side, and the branch electrodes. The resistor is formed by connecting a plurality of branch electrodes to the opposite positions of the opposite-potential electrode and forming a pair, and connecting electrodes having parallel portions, and electrically connected to the parallel portions of the connection electrodes. The sheet heating element is set in a relationship of S1> S2, where S1 is the width dimension S2 and the width dimension S2 of the parallel portion of the connection electrode.