Heating element and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9611171-B2
Application number	US-93460509-A
Country	US
Kind code	B2
Filing date	Mar 17, 2009
Priority date	Jun 13, 2008
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

Provided are a heating element that includes: a transparent substance; a conductive heating line that is provided on at least one side of the transparent substance; bus bars that is electrically connected to the conductive heating line; and a power portion that is connected to the bus bars, wherein 30% or more of the entire area of the transparent substance has a conductive heating line pattern that is formed of closed figures where a distribution is continuous and a ratio (area distribution ratio) of a standard deviation in respects to an average value of areas of the closed figures is 2% or more, and a method for manufacturing the same.

First claim

The invention claimed is:

1. A heating element comprising:
a transparent substance;
a plurality of conductive heating lines provided on at least one side of the transparent substance, the plurality of conductive heating lines forming a pattern of irregularly distributed closed figures forming a boundary of figures that form a Voronoi diagram, wherein the pattern of irregularly distributed closed figures is continuous and covers at least 90% of the entire area of the transparent substance and includes at least 100 closed figures, and wherein a standard deviation of the area of the closed figures is between 20% and 100% of the average area of the closed figures; and
bus bars that are electrically connected to the plurality of conductive heating lines,
wherein the plurality of conductive heating lines forming a pattern of irregularly distributed closed figures minimize diffraction and interference such that a light intensity, which is measured when the light emitted from a light source that is disposed at a distance of 7 m from the heating element passes through the heating element for every 5° in a circumferential direction of the light source, has a maximum standard deviation of 15,
wherein the plurality of conductive heating lines forming a pattern of irregularly distributed closed figures minimize diffraction and interference such that a light transmittance of the heating element with respect to a predetermined circle that has a diameter of 20 cm has a maximum standard deviation of 5%,
wherein the conductive heating lines are provided at an interval of 50 micrometers to 0.65 mm between adjacent lines,
wherein a line width of the plurality of conductive heating lines is between 5 micrometers to 100 micrometers, and a height of the plurality of conductive heating lines from the surface of the transparent substance is in the range of 1 to 100 micrometers,
wherein an opening ratio of the plurality of conductive heating lines is 70% or more, the opening ratio being the ratio of an area of the transparent substance that is not covered with the pattern of irregularly distributed closed figures divided by the overall area, and
wherein the plurality of conductive heating lines forming a pattern of irregularly distributed closed figures are configured to have a surface resistance of 5 ohm/square or less, and a heating amount of 100 to 500 W per m 2 .

2. The heating element according to claim 1 , wherein transparent substance is further provided on a side on which the conductive heating lines of the transparent substance are provided.

3. The heating element according to claim 1 , wherein the transparent substance is glass, plastic substrate or plastic film.

4. The heating element according to claim 1 , wherein the heating element includes an area in which the conductive heating lines are not formed.

5. The heating element according to claim 1 , wherein the conductive heating lines are blackened.

6. The heating element according to claim 1 , wherein the heating element is for a front window of vehicles.

7. The heating element according to claim 1 , further comprising a power portion that is connected to the bus bars.

Assignees

• Choi Hyeon
• Kim Su-Jin
• Hwang Ji-Young
• Oh Seung-Tae
• Kim Ki-Hwan
• Chun Sang-Ki
• Hong Young-Jun
• Hwang In-Seok
• Lee Dong-Wook
• Lg Chemical Ltd

Inventors

• Choi Hyeon
• Kim Su-Jin
• Hwang Ji-Young
• Oh Seung-Tae
• Kim Ki-Hwan
• Chun Sang-Ki
• Hong Young-Jun
• Hwang In-Seok
• Lee Dong-Wook

Classifications

• H05B3/84

  Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields · CPC title

• H05B2203/017

  Manufacturing methods or apparatus for heaters · CPC title

• C03C17/34 Primary

  with at least two coatings having different compositions (C03C17/44 takes precedence) · CPC title

• B60S1/02

  Cleaning windscreens, windows or optical devices {(wind deflectors specially adapted for preventing soiling of windows or windscreens B60J1/2002)} · CPC title