US 12,225,690 B2
Apparatus having magnetic fluid heat transport system
Genki Tanaka, Tokyo (JP); Akira Watanabe, Tokyo (JP); and Akinori Inagaki, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 6, 2023, as Appl. No. 18/502,629.
Application 18/502,629 is a division of application No. 17/666,323, filed on Feb. 7, 2022, granted, now 11,839,052.
Claims priority of application No. 2021-021461 (JP), filed on Feb. 15, 2021.
Prior Publication US 2024/0074106 A1, Feb. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H05K 7/20 (2006.01); H01F 7/02 (2006.01); H04N 23/52 (2023.01); H04N 23/68 (2023.01)
CPC H05K 7/20272 (2013.01) [H04N 23/52 (2023.01); H04N 23/687 (2023.01); H01F 7/02 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An image pickup apparatus comprising:
an image sensor as a heating portion;
a cooling portion,
a conduit configured to circulate magnetic fluid having temperature sensitivity between the image sensor and the cooling portion;
a magnetic field generator disposed on an object side in an optical axis direction further than the conduit and configured to apply a magnetic field to the magnetic fluid; and,
wherein the conduit includes a first conduit area in which the magnetic fluid receives heat from the image sensor, a second conduit area from the first conduit area to the cooling portion, a third conduit area in which the magnetic fluid is cooled by the cooling portion, and a fourth conduit area from the cooling portion to the image sensor,
wherein, when the image pickup apparatus is viewed from a back side in the optical axis direction, the magnetic field generator is disposed between the first conduit area and the third conduit area, and
wherein a conduit volume inside the first conduit area is larger than that inside any of the second, third and fourth conduit areas.