Patents by Inventor Yuji Isoda
Yuji Isoda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 6507040Abstract: In a radiation image read-out apparatus, the line sensor has a light receiving face whose width in the transverse direction of the line portion of the stimulable phosphor sheet exposed to the line stimulating beam is such that 30% to 90% of the amount of stimulated emission corresponding to a part of the stimulated emission spreading beyond the width of the line stimulating light beam as measured on the plane of the light receiving face of the stimulated emission detecting means can be received by the light receiving face in addition to the amount of stimulated emission corresponding to the width of the line stimulating light beam.Type: GrantFiled: April 3, 2001Date of Patent: January 14, 2003Assignee: Fuji Photo Film Co., Ltd.Inventor: Yuji Isoda
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Patent number: 6444997Abstract: A radiation image read-out apparatus including a lens array and a line sensor for reading an image recorded on a stimulable phosphor sheet provides a read-out image of high quality which is free from a spurious pattern due to non-aperture regions of the lens array. A first memory stores an image signal representing the image recorded on the stimulable phosphor sheet. Spurious pattern signal calculating means calculates a spurious pattern signal based on positions of the non-aperture regions on the lens array. The spurious pattern signal is stored in a second memory. Image modification means reads the image signal and the spurious pattern signal from the first and second memories to calculate a processed image signal free from any spurious pattern signal on a pixel-by-pixel basis. The spurious pattern signal may instead be obtained by causing the apparatus to read a uniform radiation image recorded on the stimulable phosphor sheet.Type: GrantFiled: March 15, 2001Date of Patent: September 3, 2002Assignee: Fuji Photo Film Co., Ltd.Inventor: Yuji Isoda
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Publication number: 20020100885Abstract: Stimulating rays produced by a line light source are linearly irradiated onto an area of a stimulable phosphor sheet, on which a radiation image has been stored, the stimulating rays causing the sheet to emit light in proportion to an amount of energy stored thereon during its exposure to radiation. Light emitted from the exposed linear area of the sheet is received with a line sensor comprising photoelectric conversion devices arrayed along each of a length direction of the linear area of the stimulable phosphor sheet and a direction normal to the length direction. The sheet is moved with respect to the line light source and the line sensor and in a direction different from the length direction of the linear area of the sheet. Operation processing is performed on outputs of the photoelectric conversion devices, which outputs have been obtained at respective positions of movement and correspond to an identical site on the sheet.Type: ApplicationFiled: June 21, 2001Publication date: August 1, 2002Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Yuji Isoda, Sumihiro Nishihata, Satoshi Arakawa, Kenji Takahashi, Ichirou Miyagawa, Katsuhiro Kohda
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Publication number: 20020074501Abstract: A green light emitting from a terbium-samarium co-activated alkaline earth metal rare earth oxide phosphor which is composed of an oxygen atom and a composition of the formula:Type: ApplicationFiled: February 2, 2001Publication date: June 20, 2002Inventors: Yuji Isoda, Yasuo Iwabuchi
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Patent number: 6387297Abstract: A rare earth fluoride phosphor favorably employable for the incorporation into a radiographic intensifying screen has the following formula (I) or (II): (Gd1−xLnx)F3·aMX (I) LnF3·aMX:yA (II) in which Ln is Y, La or Lu; M is Na, K, Cs or Rb; X is F, Cl, Br or I; A is Ce, Tb or Bi; and a, x and y numbers satisfying the conditions of 0<a≦0.03 and 0≦x≦0.1, 0<y≦0.1, respectively.Type: GrantFiled: June 4, 1999Date of Patent: May 14, 2002Assignee: Fuji Photo Film Co., Ltd.Inventor: Yuji Isoda
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Publication number: 20020050570Abstract: A stimulable phosphor sheet is prepared by applying an electron beam to a stimulable phosphor or its source in a vacuum to vaporize a phosphor or its source and depositing the vaporized phosphor or source on the support, under the condition that the electron beam is applied to the stimulable phosphor or source at an accelerating voltage of 1.5 kV to 5.0 kV. The stimulable phosphor or its source is preferably in the form of a solid having a relative density of 80% to 98%.Type: ApplicationFiled: June 1, 2001Publication date: May 2, 2002Inventor: Yuji Isoda
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Publication number: 20020041977Abstract: An europium activated cesium bromide phosphor having the formula of CsBr:xEu [0<x≦0.2], in which a relationship between an emission intensity (IE) of Eu2+ and a coloring intensity (IF) at F (Br−) center satisfies the condition of 0.2≦IExIF, and/or in which a ratio of Eu2+ to Eu3+ contained in the phosphor in terms of emission intensity satisfies the condition of 5×10−5≦Eu3+/Eu2+≦0.1 gives an increased stimulated emission amount and is favorably employed for producing a radiation image storage sheet.Type: ApplicationFiled: June 25, 2001Publication date: April 11, 2002Inventors: Yasuo Iwabuchi, Yuji Isoda
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Publication number: 20010052582Abstract: A radiation image read-out apparatus including a lens array and a line sensor for reading an image recorded on a stimulable phosphor sheet provides a read-out image of high quality which is free from a spurious pattern due to non-aperture regions of the lens array. A first memory stores an image signal representing the image recorded on the stimulable phosphor sheet. Spurious pattern signal calculating means calculates a spurious pattern signal based on positions of the non-aperture regions on the lens array. The spurious pattern signal is stored in a second memory. Image modification means reads the image signal and the spurious pattern signal from the first and second memories to calculate a processed image signal free from any spurious pattern signal on a pixel-by-pixel basis. The spurious pattern signal may instead be obtained by causing the apparatus to read a uniform radiation image recorded on the stimulable phosphor sheet.Type: ApplicationFiled: March 15, 2001Publication date: December 20, 2001Inventor: Yuji Isoda
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Patent number: 6326636Abstract: Stimulating rays produced by a line light source are linearly irradiated onto an area of a stimulable phosphor sheet, on which a radiation image has been stored, the stimulating rays causing the sheet to emit light in proportion to an amount of energy stored thereon during its exposure to radiation. Light emitted from the exposed linear area of the sheet is received with a line sensor comprising photoelectric conversion devices arrayed along each of a length direction of the linear area of the stimulable phosphor sheet and a direction normal to the length direction. The sheet is moved with respect to the line light source and the line sensor and in a direction different from the length direction of the linear area of the sheet. Operation processing is performed on outputs of the photoelectric conversion devices, which outputs have been obtained at respective positions of movement and correspond to an identical site on the sheet.Type: GrantFiled: June 10, 1999Date of Patent: December 4, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Isoda, Sumihiro Nishihata, Satoshi Arakawa, Kenji Takahashi, Ichirou Miyagawa, Katsuhiro Kohda
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Publication number: 20010042823Abstract: A radiation image read-out apparatus includes a stimulating light beam source, and a photodetector which receives stimulated emission emitted upon exposure to the stimulating light beam from portions of the stimulable phosphor sheet exposed to the stimulating light beam or the back side of the sheet opposed to the portions exposed to the stimulating light beam and converts the amount of stimulated emission to an electric signal. The photodetector comprises a CCD provided with a protective member which is permeable to light in the wavelength band of the stimulated emission and impermeable to light in the wavelength band of the stimulating light.Type: ApplicationFiled: May 17, 2001Publication date: November 22, 2001Applicant: FUJI PHOTO FILM CO., LTD.Inventor: Yuji Isoda
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Publication number: 20010040226Abstract: Stimulating rays produced by a line light source are linearly irradiated onto an area of a stimulable phosphor sheet, on which a radiation image has been stored, the stimulating rays causing the sheet to emit light in proportion to an amount of energy stored thereon during its exposure to radiation. Light emitted from the exposed linear area of the sheet is received with a line sensor comprising photoelectric conversion devices arrayed along each of a length direction of the linear area of the stimulable phosphor sheet and a direction normal to the length direction. The sheet is moved with respect to the line light source and the line sensor and in a direction different from the length direction of the linear area of the sheet. Operation processing is performed on outputs of the photoelectric conversion devices, which outputs have been obtained at respective positions of movement and correspond to an identical site on the sheet.Type: ApplicationFiled: June 21, 2001Publication date: November 15, 2001Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Yuji Isoda, Sumihiro Nishihata, Satoshi Arakawa, Kenji Takahashi, Ichirou Miyagawa, Katsuhiro Kohda
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Patent number: 6315924Abstract: A terbium-samarium co-activated alkaline earth metal rare earth oxide phosphor which is composed of an oxygen atom and a composition of the formula (I): MIIMIII2:xTb,ySm (I) [MII is Mg, Ca, Sr or Ba; MIII is Y, La, Gd or Lu; and x and y are numbers of 0<x≦0.1 and 0<y≦0.1] produces with time difference plural emissions having different colors by application of radiations such as X-rays and UV-light, so that the phosphor can be employed as a switching element or a display element giving color changing.Type: GrantFiled: December 8, 1999Date of Patent: November 13, 2001Assignee: Fuji Photo Film Co., Ltd.Inventor: Yuji Isoda
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Publication number: 20010032943Abstract: Stimulating rays produced by a line light source are linearly irradiated onto an area of a stimulable phosphor sheet, on which a radiation image-has been stored, the stimulating rays causing the sheet to emit light in proportion to an amount of energy stored thereon during its exposure to radiation. Light emitted from the exposed linear area of the sheet is received with a line sensor comprising photoelectric conversion devices arrayed along each of a length direction of the linear area of the stimulable phosphor sheet and a direction normal to the length direction. The sheet is moved with respect to the line light source and the line sensor and in a direction different from the length direction of the linear area of the sheet. Operation processing is performed on outputs of the photoelectric conversion devices, which outputs have been obtained at respective positions of movement and correspond to an identical site on the sheet.Type: ApplicationFiled: June 21, 2001Publication date: October 25, 2001Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Yuji Isoda, Sumihiro Nishihata, Satoshi Arakawa, Kenji Takahashi, Ichirou Miyagawa, Katsuhiro Kohda
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Publication number: 20010032944Abstract: Stimulating rays produced by a line light source are linearly irradiated onto an area of a stimulable phosphor sheet, on which a radiation image-has been stored, the stimulating rays causing the sheet to emit light in proportion to an amount of energy stored thereon during its exposure to radiation. Light emitted from the exposed linear area of the sheet is received with a line sensor comprising photoelectric conversion devices arrayed along each of a length direction of the linear area of the stimulable phosphor sheet and a direction normal to the length direction. The sheet is moved with respect to the line light source and the line sensor and in a direction different from the length direction of the linear area of the sheet. Operation processing is performed on outputs of the photoelectric conversion devices, which outputs have been obtained at respective positions of movement and correspond to an identical site on the sheet.Type: ApplicationFiled: June 21, 2001Publication date: October 25, 2001Inventors: Yuji Isoda, Sumihiro Nishihata, Satoshi Arakawa, Kenji Takahashi, Ichirou Miyagawa, Katsuhiro Kohda
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Publication number: 20010028047Abstract: In a radiation image read-out apparatus, the line sensor has a light receiving face whose width in the transverse direction of the line portion of the stimulable phosphor sheet exposed to the line stimulating beam is such that 30% to 90% of the amount of stimulated emission corresponding to a part of the stimulated emission spreading beyond the width of the line stimulating light beam as measured on the plane of the light receiving face of the stimulated emission detecting means can be received by the light receiving face in addition to the amount of stimulated emission corresponding to the width of the line stimulating light beam.Type: ApplicationFiled: April 3, 2001Publication date: October 11, 2001Inventor: Yuji Isoda
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Patent number: 6290873Abstract: There is provided a method for preparing a highly accelerated-phosphorescent phosphor whose erasability and after-image characteristic are both improved. Phosphor materials are mixed together to obtain a mixture, and the mixture of phosphor materials is fired in a furnace having a firing region whose capacity is 2 to 500 L per kilogram of the mixture, at a temperature of 550 to 1000° C. while introducing 1 to 200 ml of oxygen in volume at room temperature per liter capacity of the firing region in the furnace, to thereby prepare a phosphor represented by the following compositional formula (I): (Ba1−a, MIIa)FX.bMI.cMIII.dA:xLn (I) wherein, MIIa is alkaline earth metal such as Sr, Ca or Mg; MI is alkali metal such as Li, Na or K; MIII is Al, Ga or In; X is Cl, Br or I; Ln is rare earth element such as Ce, Eu or the like; A is a metallic oxide such as Al2O3; and a, b, c, d and x are numerical values within the ranges of 0≦a≦0.Type: GrantFiled: December 23, 1999Date of Patent: September 18, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Kenji Takahashi, Chiyuki Umemoto, Makoto Funabashi, Yuji Isoda
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Publication number: 20010015416Abstract: A radio-conductive material which exhibits conductivity upon exposure to radiations is formed of alcohol-soluble nylon and inorganic material having radiation absorbing power.Type: ApplicationFiled: February 7, 2001Publication date: August 23, 2001Inventor: Yuji Isoda
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Patent number: 6255660Abstract: A stimulable phosphor sheet giving a high sensitivity and a high sharpness in a radiation image recording and reproducing method is composed of a stimulable phosphor-containing partition which divides the phosphor sheet along its plane into small sections, and stimulable phosphor-incorporated area which is divided with the partition and which has a reflectivity with respect to stimulating rays differing from a reflectivity with respect to the stimulating rays of the partition.Type: GrantFiled: March 15, 1999Date of Patent: July 3, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Isoda, Kenji Takahashi, Katsuhiro Kohda, Yasuo Iwabuchi, Hiroshi Matsumoto, Seiji Tazaki
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Patent number: 6252243Abstract: A stimulable phosphor sheet giving a high sensitivity and a high sharpness in a radiation image recording and reproducing method is composed of a partition containing a phosphor that emits a light in a UV or visible region upon absorbing the applied radiation which divides the phosphor sheet on its plane into small sections, and stimulable phosphor-incorporated area which is divided with the partition and which has a reflectivity to stimulating rays differing from a reflectivity to the stimulating rays of the partition.Type: GrantFiled: September 17, 1999Date of Patent: June 26, 2001Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuji Isoda, Kenji Takahashi, Yasuo Iwabuchi, Hiroshi Matsumoto, Katsuhiro Kohda, Seiji Tazaki
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Patent number: 6048468Abstract: A cerium activated alkaline earth metal fluorohalide phosphor having the formula (I):M.sup.II FBr.sub.1-x I.sub.x :aCe,bM.sup.I,cM.sup.IV F.sub.4(I)[M.sup.II is Mg, Ca, Sr or Ba; M.sup.I is Li, Na, K, Rb or Cs; M.sup.IV is a tetravalent metal element; and x, a, b and c are numbers of 0.ltoreq.x.ltoreq.0.30, 0.00001.ltoreq.a.ltoreq.0.01, 0<b.ltoreq.0.01 and 0<c.ltoreq.0.001] and a radiation image storage panel utilizing the phosphor.Type: GrantFiled: March 31, 1999Date of Patent: April 11, 2000Assignee: Fuji Photo Film, Co., Ltd.Inventor: Yuji Isoda