# US 4,394,581 A · Radiation image storage panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,394,581 A - Document ID: US4394581A - Status: Granted - Kind: A - Application number: 06/156,520 - Filed: 1980-06-05 - Granted: 1983-07-19 - Earliest claimed: 1979-06-07 - Assignees: Fuji Photo Film Co., Ltd. - Inventors: Kenji Takahashi; Hisashi Yamazaki; Junji Miyahara; Noboru Kotera; Shusaku Eguchi; Norio Miura - Web page: https://patentgrep.com/patent/US4394581A ## CPC - G21K 4/00: Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens (photographic processes using X-ray intensifiers G03C5/17; discharge tubes comprising luminescent screens H01J1/62; cathode ray tubes for X-ray conversion with optical output H01J31/50) - F21K 2/00: Non-electric light sources using luminescence (using excitation by radioactivity G21H3/02, H01J65/06, H01J65/08; using excitation by an external electromagnetic field or by external corpuscular radiation H01J65/04); Light sources using electrochemiluminescence - G01T 1/10: Luminescent dosimeters - G03C 5/17: using screens to intensify X-ray images (X-ray conversion screens G21K4/00) - G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - 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) - G03C: PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES (for photomechanical purposes G03F); PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY (photographic processes characterised by the use or manipulation of apparatus classifiable per se in subclass G03B, see G03B; photomechanical production of textured or patterned surfaces G03F; electrophotography, magnetography G03G) ## Abstract A radiation image storage panel having a fluorescent layer which comprises a binder and a stimulable phosphor dispersed therein. Further, the panel is colored with a colorant so that the mean reflectance of the panel in the wavelength region of the stimulating rays of the stimulable phosphor is lower than the mean reflectance of the panel in the wavelength region of the light emitted by the stimulable phosphor upon stimulation thereof. The panel provides an image of high sharpness. ## Claims ### Claim 1 A radiation image storage panel having a fluorescent layer comprising a binder and a stimulable phosphor dispersed therein characterized in that said panel is colored with a colorant so that the mean reflectance of said panel in the wavelength region of the stimulating rays for said stimulable phosphor is lower than the mean reflectance of said panel in the wavelength region of the light emitted by said stimulable phosphor upon stimulation thereof. ### Claim 2 (depends on 1) A radiation image storage panel as defined in claim 1 wherein the mean reflectance of said panel in the wavelength region of said stimulating rays is not higher than 95% of the mean reflectance of a panel equivalent to said panel except for being uncolored with said colorant in the wavelength region of said stimulating rays. ### Claim 3 (depends on 1) A radiation image storage panel as defined in claim 1 wherein the mean reflectance in said panel in the wavelength region of said light is now lower than 30% of the mean reflectance of a panel equivalent to said panel except for being uncolored with said colorant in the wavelength region of said light. ### Claim 4 (depends on 3) A radiation image storage panel as defined in claim 3 wherein said mean reflectance in said panel is not lower than 90% of the mean reflectance of said equivalent panel. ### Claim 5 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel consists solely of said fluorescent layer, said fluorescent layer being colored with said colorant. ### Claim 6 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a first protective layer, a fluorescent layer disposed thereon, and a second protective layer disposed further thereon, and at least one of said layers is colored with said colorant. ### Claim 7 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a substrate and a fluorescent layer provided thereon, and said substrate and/or said fluorescent layer is colored with said colorant. ### Claim 8 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a substrate, a primer layer disposed thereon and a fluorescent layer disposed further thereon, and at least one of said substrate and said layers is colored with said colorant. ### Claim 9 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a substrate, a fluorescent layer disposed thereon and a protective layer disposed further thereon, and at least one of said substrate and said layers is colored with said colorant. ### Claim 10 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a substrate, a primer layer disposed thereon, a fluorescent layer disposed further thereon, and a protective layer disposed further thereon, and at least one of said substrate and said layers is colored with said colorant. ### Claim 11 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a substrate, a first fluorescent layer disposed thereon, an intermediate layer disposed further thereon, and a second fluorescent layer disposed further thereon, and at least said intermediate layer is colored with said colorant. ### Claim 12 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a substrate, a first fluorescent layer disposed thereon, an intermediate layer disposed further thereon, a second fluorescent layer disposed further thereon, and a protective layer disposed further thereon, and at least said intermediate layer is colored with said colorant. ### Claim 13 (depends on 1) A radiation image storage panel as defined in claim 1 wherein said panel comprises a substrate, a primer layer disposed thereon, a first fluorescent layer disposed further thereon, an intermediate layer disposed further thereon, a second fluorescent layer disposed further thereon, and a protective layer disposed further thereon, and at least said intermediate layer is colored with said colorant.