Fuji Photo Film Company, Limited

Fuji Photo Co., Ltd.

Kazuo Horikawa

Ichirou Miyagawa

Masaru Noguchi

Yuji Ohara

Kouichi Okada

Satoshi Arakawa

Seiji Matsumoto

Yasuhiko Goto

Toshitaka Agano

Shinji Imai

Mitsuru Sawano

Hiroshi Sunagawa

Chiaki Goto

Toshiaki Suzuki

Yutaka Taniguchi

Takao Komaki

Takenori Tomita

Yoshiaki Ishino

Hideo Watanabe

Takashi Nakamura

Wataru Ito

Nobuyoshi Nakajima

Hiromi Ishikawa

Katsuhiro Kohda

Masamitsu Ishida

Nobufumi Mori

Hisatoyo Kato

Yasuhiro Kawai

Satoru Honjo

Toru Itakura

Makoto Ohgoda

Chiyuki Umemoto

Yoshihiko Okamoto

Masakazu Iwasa

Yoshimi Takasaki

Tokukazu Saito

Hirosi Tanaka

Junichi Yamada

Isoji Takahashi

Akihiro Ohga

Kenichi Yamagishi

Tomotaka Kozeki

Kozi Shimanuki

A thermal recording system for recording an image on a thermo-sensitive recording medium using a laser beam under a preheated condition of the thermo-sensitive recording medium. In the thermal recording system, a preheating device preheats the thermo-sensitive recording medium which has leuco dyes, a developer and light-absorbing dyes all provided on a support, and which develops color in a continuous tone at a density corresponding to the energy of the applied heat, to a predetermined temperature less than a color-developing temperature. A heating-beam generating device allows a laser beam to scan the thermo-sensitive recording medium so as to heat the thermo-sensitive recording medium to a predetermined color-developing temperature. Thus, the heating-beam generating device can control the laser beam in a sufficient control range, thereby making it possible to record an image on the thermo-sensitive recording medium with high accuracy.

Thermal recording system for post-heating a thermosensitive recording medium and method therefor

An image-wise exposure apparatus comprises a light source for producing recording light, to which a photosensitive material is to be exposed, and a spatial modulation device provided with a plurality of picture elements located in the form of a two-dimensional array. The spatial modulation device raster-scans the picture elements and thereby carries out spatial modulation of the recording light. A picture element shifting device changes the optical relationship between the spatial modulation device and the photosensitive material. A controller sets all of the picture elements of the spatial modulation device to a totally closed condition for a single frame period and drives the picture element shifting device while all of the picture elements of the spatial modulation device are being in the totally closed condition. Effects of a picture element shifting operation are thereby obtained sufficiently, and image-wise exposure is carried out quickly.

Image-wise exposure apparatus

Thermal recording system for preheating a thermosensitive recording

An image-wise exposure apparatus comprises a light source for producing recording light, to which a photosensitive material is to be exposed, and a spatial modulation device, which is provided with an array of picture elements and carries out spatial modulation of the recording light. A shifting device changes the optical relationship between the spatial modulation device and the photosensitive material. In cases where the number of exposure dots formed on the photosensitive material is increased by a factor of m with a picture element shifting step carried out with respect to a certain array direction of the picture elements, and the period, with which periodical nonuniformity in image density obtained by exposure occurs with respect to the array direction of the picture elements when the shifting step is not carried out, is n times as long as the pitch between the picture elements, the distance of shift of the picture elements with respect to the array direction of the picture elements is set to be approximately (n.+-.1)/m times as long as the pitch between the picture elements.

Image-wise exposure apparatus and image displaying apparatus

A beam-combining laser beam source device comprising an airtight housing and a laser beam source unit housed in the housing. The laser beam source unit comprises laser beam sources and collimator optical systems respectively positioned in optical paths of laser beams, which are radiated from the laser beam sources, in order to collimate the laser beams. Optical path adjusting elements are respectively positioned in the optical paths of the laser beams in order to radiate the laser beams along optical paths parallel and close to one another. The laser beam sources, the collimator optical systems, and the optical path adjusting elements are supported on a single support. The housing is provided with a temperature sensor, which detects the temperature in the housing, and temperature adjusting elements which heat or chill the housing on the basis of control of the temperature sensor so that the temperature in the housing is kept constant.

Beam-combining laser beam source device

An image recording and read-out apparatus comprises an endless recording belt having a stimulable phosphor layer, a group of conveyor rollers for supporting and circulating the recording belt, a snaking detection means for detecting the amount and direction of snaking of the recording belt, and a snaking suppression means for suppressing snaking of the recording belt which, in response to the output of the snaking detection means, swings the axis of rotation of a prescribed one of the group of conveyor rollers in a direction which produces substantially no change in the length of the conveyance path of the recording belt.

Radiation image recording and read-out apparatus

In an image read-out apparatus, a recording medium, on which an image has been recorded, is two-dimensionally scanned with a light beam. Light, which is radiated out of the recording medium during the scanning and which represents the image, is detected with a photoelectric sensor, and a time-serial image signal is thereby generated. In the course of generating the image signal, a peak value dectector sequentially detects peak values occurring at parts of the image signal. A light detecting sensitivity controller controls the sensitivity, with which the photoelectric sensor detects the light radiated out of the recording medium, in accordance with the peak values, which have been detected sequentially, such that the value of the image signal does not exceed a predetermined value. A correction device corrects the image signal in accordance with a signal representing the sensitivity, with which the photoelectric sensor detects the light radiated out of the recording medium.

Image read-out apparatus

A radiation image recording and read-out apparatus includes a recording belt in the form of an endless belt having a stimulable phosphor layer and a recording belt coveying roller system including a plurality of rollers. The recording belt conveying roller system is provided with a tension roller which is urged by a spring to outwardly tense the recording belt, and the spring is connected to a tension releasing member which causes the spring to release the tension roller.

Digital image signals are detected from radiation images of an object constituted of bones and soft tissues. A subtraction process is carried out with a predetermined parameter on the digital image signals, and a difference signal representing an image of part of the object is obtained. Each of images of a phantom, which has part exhibiting an equivalent radiation absorption coefficient to bones and/or part exhibiting an equivalent radiation absorption coefficient to soft tissues, is read out together with each object image. A value of the parameter is found, with which the image of either part of the phantom becomes erased in a subtraction image of the phantom obtained from subtraction processing. The value of the parameter, which has thus been found, is determined as an optimum value of the parameter. Subtraction processing is then carried out by using the optimum value of the parameter.

Method and apparatus for forming energy subtraction images

A radiation image recording and read-out apparatus comprises an endless recording belt provided with a stimulable phosphor layer; a group of rollers, around which the recording belt is applied, including two roller sections spaced from each other by a predetermined distance, for circulating the recording belt between the two roller sections along the predetermined distance; an image recording section for exposing the stimulable phosphor layer to radiation; an image read-out section for scanning the stimulable phosphor layer carrying a radiation image stored thereon with stimulating rays; and an erasing section. The predetermined distance between the roller sections is 1-1.5 times as long as the length of the largest single image recordable in the image recording section. The image recording section faces the recording belt moving between the roller sections. The image read-out section carries out scanning of the stimulable phosphor layer with stimulating rays at the circumferential surface of a roller in the group of rollers.

A logarithmic amplifier comprises an amplifier provided with a feedback circuit, a logarithmic conversion device in the feedback circuit, an oscillation preventing circuit which is provided with a capacitor connected in parallel with the logarithmic conversion device, and a control circuit. The control circuit controls the oscillation preventing circuit in accordance with the current fed into the logarithmic amplifier, so that the amount of certain components in the output from the amplifier, which components are fed back to an input terminal of the amplifier through the oscillation preventing circuit, decreases as the current fed into the logarithmic amplifier becomes smaller. An image read-out apparatus comprises a photoelectric detector which detects light from a recording medium, which light is emitted by the recording medium when it is scanned, and the logarithmic amplifier into which the output current generated by the photoelectric detector is fed. An image having good sharpness is thereby obtained.

Logarithmic amplifier, and image read-out apparatus using the same

A beam-combining laser beam source device comprising laser beam sources; collimator optical systems positioned in optical paths of laser beams radiated from the laser beam sources. Each of the collimator optical systems is constituted of a first lens section and a second lens section. Optical path adjusting elements are positioned in the optical paths of the laser beams in order to radiate the laser beams along optical paths parallel and close to one another. A support member supports the laser beam sources, the collimator optical systems, and the optical path adjusting elements. Each laser beam source and the corresponding first lens section are combined into a laser beam source unit and mounted on the support member, the positions of the laser beam source and the first lens section having been adjusted with respect to each other. The second lens section corresponding to the laser beam source unit is mounted on the support member with the position of the second lens section being adjusted with respect to the position of the laser beam source unit in a plane which is normal to the otpical axis of the laser beam source unit.

Shading is eliminated in an image read-out apparatus wherein a light beam is deflected by a rotating polygon mirror which has a plurality of reflecting surfaces, a surface which has an image recorded thereon is two-dimensionally scanned with the deflected light beam, and light which is emitted by the scanned surface and which carries information about the image is detected and converted into an image signal by a photoelectric read-out device. The shading elimination method comprises the steps of storing the characteristics of the shading with respect to the respective reflecting surfaces, the shading being caused by nonuniformity in the intensity of the light beam, nonuniformity in the speed at which the surface is scanned with the light beam, nonuniformity in how the photoelectric read-out device, detects light which is emitted by said surface, or the like. Fluctuations in the image signal, which are caused by the shading, are eliminated with respect to the respective reflecting surfaces on the basis of the shading characteristics which correspond to the respective reflecting surfaces.

Shading elmination method for an image read-out apparatus

A Potter-Bucky device for a radiation image recording apparatus in which an image recording medium is exposed to radiation which has passed through an object in order to record a radiation image of the object on the recording medium includes a grid which is supported by a support member between the object and the recording medium and is reciprocated parallel to the recording medium. A balancer is also connected to the support member and is reciprocated in synchronization with said grid but in the opposite direction.

Potter-bucky device

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Kanagawa, Japan

Kazuo Horikawa