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Planar heat-generating body and method for manufacturing same

A manufacturing method and heating element technology, applied in the direction of electric heating devices, ohmic resistance heating, heating element materials, etc., to achieve good defogging performance, suppression of electrical conductivity reduction, and long-term good heating performance

Inactive Publication Date: 2014-02-05
TOKYO COSMOS ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the width of the main electrode in the terminal region shown in Patent Document 1 is significantly larger than the width of the comb-shaped electrode, and there is no suggestion to reduce it.

Method used

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  • Planar heat-generating body and method for manufacturing same
  • Planar heat-generating body and method for manufacturing same
  • Planar heat-generating body and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A planar heating element test piece was produced in the following manner. After heat-bonding the aluminum foil with a hot-melt adhesive to the base film 21 made of polyester film, the aluminum foil was peeled off with a cutter to form electrode patterns (electrodes 22 and 23 ). The main electrodes 22a, 23a have a width of 3 mm, and the comb-shaped electrodes 22b, 23b have a width of 1 mm. Next, a conductive paste obtained by kneading carbon black and graphite powder in phenol resin was screen-printed on the electrodes 22 and 23 , and heat-cured (150° C., 5 minutes to 10 minutes) to form the conductive coating 24 . The thickness of the conductive film 24 is 10 μm. The resistivity of the conductive coating 24 at this time was 0.2 Ω·cm. Then, the PTC heating element paste (resistivity: 50 Ω·cm) was printed to form the PTC heating element film 25, the terminals 27 for energization were installed, and the double-sided adhesive tape 29 was attached to complete the planar he...

Embodiment 2

[0046] Two planar heating element test pieces were produced in the following manner. The electrode patterns and the conductive film 24 of the two test pieces were formed by the same procedure as in Example 1. The resistivities of the conductive coatings 24 of the two test pieces were 0.02 Ω·cm and 20 Ω·cm, respectively, and the total film thickness was 10 μm. The PTC heating element paste (resistivity: 50 Ω·cm) was printed, and two planar heating element test pieces were completed through the same process as in Example 1. The resistance values ​​between terminals 27 are 15.8Ω and 31.0Ω, respectively.

[0047] These planar heating element test pieces were placed in the same high-temperature and high-humidity state as in Example 1, and the resistance value after 72 hours was measured. The resistance value measurement results were 1.02 times and 1.05 times, respectively, which were values ​​that hardly changed from the initial state.

[0048] In addition, the same temperature ...

Embodiment 3

[0050] Two planar heating element test pieces were produced in the following manner. The electrode patterns and the conductive film 24 of the two test pieces were formed by the same procedure as in Example 1. The film thicknesses of the conductive coatings 24 of the two test pieces were 5 μm and 70 μm, respectively, and the total resistivity was 0.2 Ω·cm. The PTC heating element paste (resistivity: 50 Ω·cm) was printed, and two planar heating element test pieces were completed through the same process as in Example 1. The resistance values ​​between terminals 27 are 16.52Ω and 15.64Ω, respectively.

[0051] The same temperature cycle test as in Example 1 was implemented on these planar heating element test pieces. The resistance value was measured after five cycles, and it became 0.98 times and 1.02 times, respectively, showing little change.

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PUM

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Abstract

A self-temperature-controlling-type planar heat-generating body mounted on the back surface of a mirror, wherein a satisfactory defogging performance and a satisfactory long-term heat-generating performance can be obtained. This invention is provided with a base film (21), electrodes (22, 23) formed by patterning an aluminum foil on the base film (21), an electroconductive coating (24) formed on the surface of the electrodes (22, 23), and a PTC heat-generating body film (25) formed so as to cover the electrodes (22, 23) with the electroconductive coating (24) interposed therebetween. The electroconductive coating (24) has a configuration in which an electroconductive material is mixed into a phenol resin or an epoxy resin.

Description

technical field [0001] The present invention relates to a temperature self-controlling planar heating element and its manufacturing method. The planar heating element is installed on the back of a mirror such as a rearview mirror of a motor vehicle, and is used for defrosting and antifogging of the mirror. Background technique [0002] In order to remove frost and fog that obstruct vision in rearview mirrors of motor vehicles, a method of attaching a planar heating element to the back of the mirror and removing frost and fog by heating is widely used. A temperature self-control type planar heating element that does not require an expensive temperature control device and has a positive temperature characteristic (PTC characteristic) is generally used as the planar heating element. [0003] The temperature self-control type planar heating element is generally printed on the base film made of polyester film (Ester film) by screen printing, etc., and the conductive paste mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/20H05B3/03H05B3/14
CPCH05B2203/016H05B2203/017H05B2203/003H05B3/845H05B3/14H05B3/20H05B3/84
Inventor 佐藤胜平野和幸落合佑介
Owner TOKYO COSMOS ELECTRIC CO LTD
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