US 12,477,627 B2
Film heater
Koutarou Fukuda, Kariya (JP); Kouji Oota, Kariya (JP); Syuzou Oda, Kariya (JP); Takumi Okamoto, Kariya (JP); and Taro Ogura, Kariya (JP)
Assigned to DENSO CORPORATION, Kariya (JP)
Filed by DENSO CORPORATION, Kariya (JP)
Filed on Apr. 25, 2022, as Appl. No. 17/728,641.
Application 17/728,641 is a continuation of application No. PCT/JP2020/042452, filed on Nov. 13, 2020.
Claims priority of application No. 2019-214228 (JP), filed on Nov. 27, 2019.
Prior Publication US 2022/0256656 A1, Aug. 11, 2022
Int. Cl. H05B 3/84 (2006.01); B60J 1/00 (2006.01); B60S 1/02 (2006.01)
CPC H05B 3/84 (2013.01) [B60J 1/002 (2013.01); B60S 1/026 (2013.01); H05B 2203/007 (2013.01); H05B 2203/013 (2013.01); H05B 2203/016 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A film heater to be attached to a light transmissive member through which light is transmitted in a vehicle, the film heater comprising:
a transparent conductive film configured to transmit the light and to generate heat by being energized;
a first electrode connected to the transparent conductive film; and
a second electrode connected to the transparent conductive film, wherein
the transparent conductive film includes a heat generating portion configured to heat the light transmissive member by generating heat through the energization using the first electrode and the second electrode,
an outer edge of the heat generating portion has a short side, a long side that is longer than the short side and extends while facing the short side, a first oblique side that extends from one end of the short side to approach one end of the long side, and a second oblique side that extends from another end of the short side to approach the another end of the long side,
the first electrode includes a plurality of first connection portions corresponding to a plurality of first ports that are located across the short side, the first oblique side, and the second oblique side while being spaced apart from each other,
the second electrode includes a plurality of second connection portions corresponding to a plurality of second ports that are located in a range including the long side while being spaced apart from each other,
each of the plurality of first connection portions is connected to the transparent conductive film such that current flows between an inside of the heat generating portion and the first connection portion through the corresponding first port,
each of the plurality of second connection portions is connected to the transparent conductive film such that the current flows between the inside of the heat generating portion and the second connection portion through the corresponding second port,
a plurality of first current suppression portions is disposed along the outer edge of the heat generating portion to suppress flow of the current between the inside and an outside of the heat generating portion through a region between the plurality of first ports along the outer edge of the heat generating portion,
a plurality of second current suppression portions is disposed along the outer edge of the heat generating portion to suppress flow of the current between the inside and the outside of the heat generating portion through a region between the plurality of second ports along the outer edge of the heat generating portion, and
each of some or all of the plurality of first ports is configured to flow the current through the inside of the heat generating portion between the first port and at least two second ports.