US 12,092,945 B2
Structure observation device and observation method
Takashi Iwama, Tokyo (JP); Kentaro Sato, Tokyo (JP); Shinji Sakurai, Tokyo (JP); Kayo Tokieda, Tokyo (JP); Shohei Shinozuka, Tokyo (JP); Yuhei Akiyama, Tokyo (JP); and Takashi Taniguchi, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 18/021,055
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Jul. 19, 2021, PCT No. PCT/JP2021/026964
§ 371(c)(1), (2) Date Feb. 13, 2023,
PCT Pub. No. WO2022/054412, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2020-150537 (JP), filed on Sep. 8, 2020.
Prior Publication US 2023/0296966 A1, Sep. 21, 2023
Int. Cl. G03B 17/55 (2021.01); G03B 15/03 (2021.01); G03B 17/02 (2021.01); G03B 17/56 (2021.01)
CPC G03B 17/55 (2013.01) [G03B 15/03 (2013.01); G03B 17/02 (2013.01); G03B 17/561 (2013.01); G03B 2215/0503 (2013.01); G03B 2215/0575 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A structure observation device wherein the device comprises:
a camera case of a rectangular three-dimensional shape, having a glass window of heat-resistant and/or cold-resistant glass on at least one side of the three-dimensional shape;
heat insulating walls covering the camera case except for the glass window;
a fluid supply port and a fluid discharge port through which a cooling or warming fluid is circulated into, of an inside of the camera case and an inside of the walls, at least the inside of the camera case;
a camera that is disposed inside the camera case and captures a still image or a moving image of a structure outside the camera case through the glass window and externally outputs or internally stores data of the captured image;
a lighting apparatus disposed around a lens of the camera inside the camera case; and
a tubular reflection prevention member disposed between the lens and the lighting apparatus with respect to a direction orthogonal to an optical axis of the lens, at least on an inner side of the glass window, wherein:
the glass window has a double structure composed of an inner window and an outer window;
the reflection prevention member disposed on an inner side of the inner window has a constant diameter along a longitudinal direction; and
the reflection prevention member disposed between the outer window and the inner window has a conical surface shape with a diameter increasing toward the outer window.