Patents by Inventor Junji Miyahara

Junji Miyahara 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).

  • Patent number: 4680473
    Abstract: A radiation image read-out apparatus comprises an optical system for scanning a stimulable phosphor sheet carrying a radiation image stored therein by stimulating rays, a light guide member for guiding light emitted by the stimulable phosphor sheet upon exposure to stimulating rays, a light guiding mirror for reflecting the emitted light to the light guide member, and a photoelectric converter for detecting the light guided by the light guide member. The light guiding mirror is provided with a reflection plane which reflects the light emitted by the stimulable phosphor sheet and which does not reflect stimulating rays. Or, a filter for absorbing the stimulating rays reflected by the stimulable phosphor sheet and transmitting the light emitted by the stimulable phosphor sheet is positioned between the scanned portion of the stimulable phosphor sheet and the light guiding mirror.
    Type: Grant
    Filed: March 11, 1985
    Date of Patent: July 14, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Terumi Matsuda, Toshitaka Aagano, Junji Miyahara, Nobuyoshi Nakajima, Shigeru Saotome
  • Patent number: 4651220
    Abstract: A stimulable phosphor sheet is exposed to an electron beam having passed through a specimen in an electron microscope to record a first magnified image of the specimen on the sheet. A stimulating energy is applied to the sheet for discharging light therefrom which represents the first magnified image. The light discharged from the image sensor is photoelectrically detected to reproduce the first magnified image which can be observed to attain a desired focused condition and/or a desired field on the electron microscope. Then, the same or another stimulable phosphor sheet is exposed to the electron beam to record a second magnified image of the specimen on the sheet, and the second magnified image is reproduced as a final image under the desired focused condition and/or with the desired field.
    Type: Grant
    Filed: October 10, 1985
    Date of Patent: March 17, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yuichi Hosoi, Junji Miyahara, Nobufumi Mori, Kenji Takahashi
  • Patent number: 4617468
    Abstract: A stimulable phosphor sheet preferably employable in autoradiography which comprises a substrate, a phosphor layer being provided on the substrate and comprising a stimulable phosphor dispersed in a binder, and a protective layer provided on the phosphor layer, characterized in that the surface of the protective layer is hydrophilic.The surface of the protective layer can be made hydrophilic by hydrophilic processing applied thereto or provision of a hydrophilic layer thereon.
    Type: Grant
    Filed: February 23, 1984
    Date of Patent: October 14, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hisashi Shiraishi, Hisatoyo Kato, Junji Miyahara
  • Patent number: 4539138
    Abstract: A rare earth element activated divalent metal represented by the formulaM.sup.II FX.xSiO.sub.2 :yLnwherein M.sup.II is at least one divalent metal selected from the group consisting of Ba, Ca, Sr, Mg, Zn and Cd; Ln is at least one rare earth element selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Sm and Gd; X is at least one halogen selected from the group consisting of Cl, Br and I; x and y are numbers satisfying the condition 5.times.10.sup.-5 .ltoreq.x.ltoreq.0.5 and of 0<y.ltoreq.0.2, respectively. This phosphor has improved characteristics such as the high luminance of emission, the high powder fluidity and good afterglow property.
    Type: Grant
    Filed: March 12, 1984
    Date of Patent: September 3, 1985
    Assignee: Fuji Photo Film Co. Ltd.
    Inventors: Junji Miyahara, Takashi Nakamura, Kenji Takahashi
  • Patent number: 4501683
    Abstract: A radiation image storage panel comprising a support, a phosphor layer provided thereon which comprises a binder and stimulable phosphor particles dispersed therein, and a protective film provided on said phosphor layer, characterized in that said protective film has a haze value within the range of 4-40%.
    Type: Grant
    Filed: August 31, 1983
    Date of Patent: February 26, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Satoshi Arakawa, Junji Miyahara
  • Patent number: 4400619
    Abstract: A radiation image conversion panel is made of a stimulable phosphor which stores radiation energy when exposed to a radiation and emits light when stimulated by visible light or infrared rays. The panel is subjected to excitation before it is exposed to a radiation for recording or storing a radiation image therein by exposing the panel to light having a wavelength within the range of stimulating light wavelength of the stimulable phosphor used in the panel. By exciting the panel before exposure to radiation, the energy of radiation stored therein which will cause a noise is removed therefrom.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: August 23, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Noboru Kotera, Shusaku Eguchi, Masanori Teraoka, Kenji Takahashi, Junji Miyahara
  • Patent number: 4394581
    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.
    Type: Grant
    Filed: June 5, 1980
    Date of Patent: July 19, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kenji Takahashi, Hisashi Yamazaki, Junji Miyahara, Noboru Kotera, Shusaku Eguchi, Norio Miura
  • Patent number: 4380702
    Abstract: A radiation image storage panel having a fluorescent layer which comprises a binder and a stimulable phosphor dispersed therein. Further, the panel has a light-reflecting white pigment layer on one side thereof with respect to the fluorescent layer opposite to the side exposed to the stimulating rays for said stimulable phosphor. The panel provides an image of high sharpness.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: April 19, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kenji Takahashi, Junji Miyahara
  • Patent number: 4368390
    Abstract: A radiation image storage panel having a fluorescent layer which comprises a binder and a stimulable phosphor dispersed therein. Further, the panel has a light-reflecting metallic layer on one side thereof with respect to the fluorescent layer opposite to the side exposed to the stimulating rays for said stimulable phosphor. The panel provides an image of high sharpness.
    Type: Grant
    Filed: July 11, 1980
    Date of Patent: January 11, 1983
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kenji Takahashi, Junji Miyahara
  • Patent number: 4350893
    Abstract: A radiation image storage panel having a fluorescent layer which comprises a binder and a stimulable phosphor dispersed therein. The fluorescent layer further contains a white powder dispersed therein in an amount of 0.01 to 1 parts by weight per one part by weight of the stimulable phosphor. The panel provides an image of high sharpness.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: September 21, 1982
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kenji Takahashi, Junji Miyahara
  • Patent number: 4302671
    Abstract: A radiation image recorded in a stimulable phosphor is read out by stimulating the stimulable phosphor by use of stimulating rays such as visible light or infrared rays. Upon stimulated, the stimulable phosphor emits light which is detectable by a photosensor. The radiation image readout device includes a photosensor for detecting the light emitted by the phosphor, and a reflecting optical element like a mirror located between the phosphor and the photodetector for reflecting stimulating rays advancing between the phosphor and the photosensor toward the phosphor. The reflecting optical element has a very small size not to intercept the light emitted by the phosphor and detected by the photosensor as much as possible.
    Type: Grant
    Filed: September 28, 1979
    Date of Patent: November 24, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hisatoyo Kato, Seiji Matsumoto, Junji Miyahara
  • Patent number: 4289733
    Abstract: An apparatus for producing silver halide grains of a uniform size wherein the apparatus comprises a mixing chamber comprising a casing of a polygonal-pillar shape within a reaction vessel filled with an aqueous colloid solution in such a manner that the interior of the mixing-chamber is filled with the aqueous colloid solution, where a water soluble silver salt solution and a water soluble halide solution are supplied by way of conduits to the lower end of the mixing chamber to dilute the solution with the aqueous colloidal solution contained in the mixing chamber, first agitation means disposed in the mixing chamber for rapidly agitating to mix and react both reaction liquids to form silver halide grains, and a second agitation means for immediately discharging the silver halide grains into the reaction vessel to ripen the silver halide grains outside of the mixing chamber.
    Type: Grant
    Filed: March 9, 1979
    Date of Patent: September 15, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hirokazu Saito, Keiichi Suzuki, Masayuki Shimizu, Junji Miyahara
  • Patent number: 4284889
    Abstract: In a method of recording a radiation image by use of a stimulable phosphor in which the stimulable phosphor is first exposed to an imagewise radiation to store the energy of the radiation and then is exposed to stimulating rays to emit light in accordance with the energy stored therein, the instantaneous emission of light emitted upon exposure of the stimulable phosphor to the radiation is detected to measure the level of the energy of the radiation stored in the phosphor. The instantaneous emission is detected by a photosensor which is located behind the phosphor. The output of the photosensor is utilized to control the density and/or contrast of the final image recorded on a photographic film which is recorded by use of the light emitted by the phosphor upon stimulated.
    Type: Grant
    Filed: October 1, 1979
    Date of Patent: August 18, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hisatoyo Kato, Seiji Matsumoto, Junji Miyahara
  • Patent number: 4261854
    Abstract: A barium fluorohalide phosphor represented by the formulaBaFX:xCe,yAwherein X is at least one halogen selected from the group consisting of chlorine, bromine and iodine, A is at least one metallic element selected from the group consisting of indium, thallium, gadolinium, samarium and zirconium, and x and y are numbers satisfying the conditions of 0<x.ltoreq.2.times.10.sup.31 1 and 0<y.ltoreq.5.times.10.sup.-2, respectively. The phosphor emits stimulated light of higher luminance than the conventional cerium activated barium fluorohalide phosphor when stimulated by light of wavelength ranging from 450 to 800 nm after exposure to ionizing radiations such as X-rays or .gamma.-rays, ultraviolet rays, cathode rays, or the like. Further, the phosphor emits spontaneous light of high luminance when excited by ionizing radiations, ultraviolet rays, cathode rays, or the like.
    Type: Grant
    Filed: December 18, 1979
    Date of Patent: April 14, 1981
    Assignees: Kasei Optonix, Ltd., Fuji Photo Film Co., Ltd.
    Inventors: Noboru Kotera, Shusaku Eguchi, Junji Miyahara, Seiji Matsumoto, Hisatoyo Kato
  • Patent number: 4258264
    Abstract: A radiation image recorded in a stimulable phosphor sheet or plate is visualized by stimulating the phosphor with stimulating rays. Being stimulated by the stimulating rays, the phosphor emits detectable light. The emitted light is detected by a photodetector. The wavelength of the stimulating rays is selected within the range of 600 to 700 nm. The wavelength of the light detected by the photodetector is selected within the range of 300 to 500 nm.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: March 24, 1981
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Noboru Kotera, Syusaku Eguchi, Junji Miyahara, Seiji Matsumoto, Hisatoyo Kato
  • Patent number: 4239968
    Abstract: A radiation image is recorded on a stimulable phosphor and the recorded image is reproduced by utilizing the stimulability of the phosphor. As the phosphor is used an alkaline earth metal fluorohalide phosphor having high stimulability represented by the formula(Ba.sub.1-x M.sub.x.sup.II)FX:yAwherein M.sup.II is at least one divalent metal selected from the group consisting of Mg, Ca, Sr, Zn and Cd, X is at least one halogen selected from the group consisting of Cl, Br and I, A is at least one element selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb and Er, and x and y are numbers satisfying the conditions of 0.ltoreq.x.ltoreq.0.6 and 0.ltoreq.y.ltoreq.0.2.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: December 16, 1980
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Noboru Kotera, Syusaku Eguchi, Junji Miyahara, Seiji Matsumoto, Hisatoyo Kato
  • Patent number: 4236078
    Abstract: A radiation image is recorded on a stimulable phosphor, and the recorded image is reproduced by utilizing the stimulability of the phosphor. As the phosphor is used at least one of the following phosphors.(a) a copper and lead activated zinc sulfide phosphor ZnS:Cu,Pb).(b) a phosphor included in a group of europium activated barium aluminate phosphors represented by the formulaBaO.xAl.sub.2 O.sub.3 :Euwherein x is a number satisfying the condition of 0.8.ltoreq.x.ltoreq.10.(c) a phosphor included in a group of divalent metal silicate phosphors represented by the formulaM.sup.II O.ySiO.sub.2 :Awherein M.sup.II is at least one divalent metal selected from the group consisting of Mg, Ca, Sr, Zn and Ba, A is at least one element selected from the group consisting of Ce, Tb, Eu, Tm, Pb, Tl, Bi and Mn, and y is a number satisfying the condition of 0.5.ltoreq.y.ltoreq.2.5.
    Type: Grant
    Filed: July 12, 1979
    Date of Patent: November 25, 1980
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Noboru Kotera, Syusaku Eguchi, Junji Miyahara, Seiji Matsumoto, Hisatoyo Kato
  • Patent number: 4116911
    Abstract: A rear projection screen comprising a wax and a wax reforming agent which is miscible with the wax and is present in an amount effective to increase the mechanical strength and adhesiveness of the wax.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: September 26, 1978
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Junji Miyahara, Hisatoyo Kato
  • Patent number: 4083626
    Abstract: Rear projection screens of superior mechanical and optical properties are described which comprise, in all instances, at least one light diffusion layer and at least one transparent support, an intermediate layer being provided between the light diffusion layer and the transparent support, which intermediate layer is formed from a photocurable composition.
    Type: Grant
    Filed: April 2, 1976
    Date of Patent: April 11, 1978
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Junji Miyahara, Hisatoyo Kato
  • Patent number: 4066332
    Abstract: A rear projection screen having means for controlling light direction comprising a light diffusion plate composed of wax, a crystalline polymer or a mixture thereof, and light shielding layers contained in the light diffusion plate which are parallel to the direction of image projection.
    Type: Grant
    Filed: January 23, 1976
    Date of Patent: January 3, 1978
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hisatoyo Kato, Junji Miyahara