Kasei Optonix, Ltd.

Fuji Photo Film Company, Limited

Hitachi, Ltd.

Dai Nippon Toryo Co., Ltd.

Shusaku Eguchi

Noboru Kotera

Katuzo Kanda

Norio Miura

Kazuhito Iwasaki

Junji Miyahara

Kenji Takahashi

Yoichi Oba

Thihiro Yoshida

Seiji Murakami

Toshiaki Hatsumi

Isao Iwamoto

Masaaki Hayashi

Hisatoyo Kato

Seiji Matsumoto

Hisashi Yamazaki

Masanori Teraoka

Hiroshi Takada

Tsuyoshi Kano

Hidenaga Horiuchi

A rare earth element activated complex halide phosphor represented by the formula

Phosphor

A radiation image storage panel for obtaining a radiation image of an object by causing said panel to absorb a radiation transmitted through said object and then exposing the panel to light of wavelength ranging from 450 to 800 nm to cause the panel to release radiation energy stored therein as fluorescent light, said panel having a fluorescent layer of a rare earth element activated complex halide stimulable phosphor represented by the formula

Method for obtaining a radiation image

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.

Method of and apparatus for obtaining a radiation image by use of a

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.

Radiation image storage panel

Pigment coated phosphors comprising a europium activated yttrium oxysulfide phosphor having a europium activator value within a range of 0.04 gram atom to 0.066 gram atom per 1 mol of yttrium oxysulfide having adhered thereto red colored pigment particles such as cadmium sulfoselenide pigment particles, rouge pigment particles or red lead pigment particles, in respective amounts of 0.1 to 2.0 wt %, 0.05 to 2.0 wt % or 0.1 to 12 wt %, based upon the europium activated yttrium oxysulfide phosphor; and a cathode ray tube for high contrast color television using as a red emitting phosphor at least one of the three pigment coated phosphors.

Pigment coated phosphor and high contrast color television cathode ray

A barium fluorohalide phosphor represented by the formula

Pigment-coated phosphors which may be used in the production of a cathode-ray tube of a high contrast for a color television receiver can be produced by adding a pigment and an anionic polymer emulsion to an aqueous suspension of a phosphor and then making the system neutral or weakly acidic or adding a cationic polymer emulsion or carrying out both of these steps so that the phosphor and the pigment may be coated with the polymer.

Process for producing pigment-coated phosphors

A pigment-coated phosphor having good finish sieve passability and capable of forming a fluorescent film with excellent properties can be produced from a process characterized by:

A pigment coated phosphor used as a green emitting phosphor for a high contrast color television cathode ray tube. A green emitting phosphor is coated with TiO.sub.2 --ZnO--CoO--NiO system pigment particles.

Pigment coated phosphor

On the surface of a phosphor, pigment particles are uniformly adhered by a layer of a gelatin-gum arabic mixture. A process for manufacturing such a pigment coated phosphor includes the steps of preparing an aqueous solution of gelatin and an aqueous solution of gum arabic, allowing the phosphor to disperse homogeneously into one of these aqueous solutions, allowing the pigment particles to disperse homogeneously into the other aqueous solution, and mixing the so obtained phosphor and pigment dispersions.

Growing community of inventors

Odawara, Japan

Shusaku Eguchi