# US 10,768,317 B2 · Radiographic image detection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,768,317 B2 - Document ID: US10768317B2 - Status: Granted - Kind: B2 - Application number: 16/292,718 - Filed: 2019-03-05 - Published: 2019-09-12 - Granted: 2020-09-08 - Earliest claimed: 2018-03-06 - Assignees: FUJIFILM Corporation - Applicants: FUJIFILM Corporation - Inventors: Masateru Tateishi - Web page: https://patentgrep.com/patent/US10768317B2 ## CPC - G01T 1/247: {Detector read-out circuitry (for processing gain or off-set correction H04N)} - A61B 6/4233: {using matrix detectors} - A61B 6/4283: {characterised by a detector unit being housed in a cassette} - A61B 6/505: {for diagnosis of bone} - G01T 1/244: {Auxiliary details, e.g. casings, cooling, damping or insulation against damage by, e.g. heat, pressure or the like} - G01T 7/00: Details of radiation-measuring instruments - G03B 42/02: using X-rays - G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A first sensor panel, a second sensor panel, and a base are accommodated in a housing of an electronic cassette. Circuit substrates are mounted on a rear surface of the base. The base is made of a pitch-based carbon fiber reinforced resin obtained by impregnating a pitch-based carbon fiber with a matrix resin. The fiber directions of the pitch-based carbon fibers are aligned with one direction. Therefore, the base has high thermal conductivity in a direction parallel to the fiber direction. As a result, the driving heat of the circuit substrates is rapidly diffused to the entire rear surface. ## Claims ### Claim 1 A radiographic image detection device comprising: a sensor panel in which pixels that accumulate charge in response to radiation, which has been emitted from a radiation source and transmitted through a subject, are two-dimensionally arranged; a circuit unit that converts the charge into a digital signal, outputs the digital signal as a radiographic image, and includes a plurality of circuit substrates on which various circuits are mounted; and a base that has a front surface to which the sensor panel is attached and a rear surface on which the circuit substrates are mounted and has anisotropic thermal conductivity in at least the rear surface. ### Claim 2 (depends on 1) The radiographic image detection device according to claim 1, wherein at least one of the plurality of circuit substrates has a rectangular shape in a plan view and is provided such that a long side direction is perpendicular to a direction in which thermal conductivity is high in the rear surface. ### Claim 3 (depends on 2) The radiographic image detection device according to claim 2, wherein a length of a long side of the circuit substrate is equal to or greater than a quarter of a length of a side of the base along the long side direction. ### Claim 4 (depends on 1) The radiographic image detection device according to claim 1, wherein the rear surface is divided into two equal regions, that is, a high-density region in which mounting density of the circuit substrates is relatively high and a low-density region in which the mounting density of the circuit substrates is relatively low, the circuit substrates are provided in the high-density region and the low-density region, and in the rear surface, thermal conductivity in a direction from the high-density region to the low-density region is high. ### Claim 5 (depends on 1) The radiographic image detection device according to claim 1, wherein the rear surface is divided into two equal regions, that is, a high-temperature region in which an amount of heat generated from the circuit substrates is relatively large and a low-temperature region in which the amount of heat generated from the circuit substrates is relatively small, the circuit substrates are provided in the high-temperature region and the low-temperature region, and in the rear surface, thermal conductivity in a direction from the high-temperature region to the low-temperature region is high. ### Claim 6 (depends on 1) The radiographic image detection device according to claim 1, wherein the base includes a pitch-based carbon fiber reinforced resin obtained by impregnating a pitch-based carbon fiber with a matrix resin. ### Claim 7 (depends on 6) The radiographic image detection device according to claim 6, wherein at least the rear surface of the base is made of the pitch-based carbon fiber reinforced resin. ### Claim 8 (depends on 1) The radiographic image detection device according to claim 1, wherein a sheet that is made of a pitch-based carbon fiber reinforced resin obtained by impregnating a pitch-based carbon fiber with a matrix resin is attached to the rear surface of the base. ### Claim 9 (depends on 6) The radiographic image detection device according to claim 6, wherein fiber directions of the pitch-based carbon fibers are aligned with one direction. ### Claim 10 (depends on 1) The radiographic image detection device according to claim 1, wherein a heat insulating member is attached to the front surface of the base, and the sensor panel is attached to the front surface through the heat insulating member. ### Claim 11 (depends on 1) The radiographic image detection device according to claim 1, wherein two pairs each including the sensor panel and the circuit unit are provided, and the two sensor panels are sequentially arranged in a thickness direction. ### Claim 12 (depends on 11) The radiographic image detection device according to claim 11, wherein two radiographic images output from the two circuit units are used to calculate an index value related to bones.