Dainippon Screen Seizo Kabushiki-kaisha

Dainippon Screen Mfg. Co., Ltd.

Dainippon Screen Manufacturing Co., Ltd.

Hitomi Atoji

Masuo Kunisawa

Mitsuhiko Yamada

Seiji Okazaki

Riyo Shimooka

Kunio Ikuta

Masahide Ikeda

Yuji Mizuno

Yuuzi Mizuno

Yasuaki Araki

Atsuro Hirata

Shinji Itoh

Takeshi Yamazaki

Katsuaki Kashiwabara

Yoshishige Mori

Takashi Ohara

The invention provides a device for efficiently mounting an original onto an image reading drum in an image scanning system. The mounting device includes a lower holder section and an upper holder section, each made of a flexible but hard plastic sheet. The original is held in between the lower holder section and the upper holder section and is attached onto the image reading drum, which has a predetermined thickness greater than a distance causing Newton's rings. Accordingly, image signals obtained by scanning the original effectively represent an original image without Newton's rings.

Device for mounting an original onto an image reading drum

A film applying and removing device in a drum type picture scanning recording apparatus is adapted that a photosensitive film is wound onto a rotary drum to be scanned by an exposing head, and comprises a first tray for accommodating a plurality of unexposed films, a film ascending and descending means for ascending the tip end of the film in the tray to contact it with the surface of the drum, a vacuum suctioning means to hold the tip end on the surface of the drum, an inversely rotatable driving means to rotate the drum and guide means for introducing a second tray for receiving exposed films.

Device for detachably attaching a film onto a drum in a drum type

An apparatus for mounting an unexposed film on and demounting an exposed film from a color scanner is described. The color scanner includes a recording chamber, a rotary drum therein and cassettes for containing unexposed film and exposed films which are normally mounted in communication with the recording chamber but which are detachable therefrom. There is described a light-blind window in the recording chamber which will permit an operator to extract an unexposed film from an unexposed film cassette, mount it on the rotary drum, and after it has been exposed, remove it from the rotary drum and place it in an exposed film cassette which then may be taken to a developing unit.

Apparatus for enabling an operator to mount an unexposed film on and

A method for color correction in the process for reproducing a picture in which color separation picture signals obtained by photoelectrically scanning an original picture are converted into picture signals which correspond to four printing color inks including a black ink therein to produce respective reproduction pictures for plate making corresponding to each of the color inks. A picture signal which corresponds to a black ink is produced according to gray color components obtained from B, G and R signals of the original picture, and according to chromatic color components obtained by subtracting neutral color components from said B, G and R signals. Color separation picture signals corresponding to other color inks, and deficiency in reproduction density of the black ink to be used in a black print is corrected by said other three color inks.

Method for color correction for multi-color printing plate pictures

A tint laying device for use in a picture reproducing machine, wherein a pickup head scans an original picture to pick up a picture signal and sends it to a color discriminator which discriminates a color in hue of the picture signal to output a discrimination signal to a halftone dot area rate controller, wherein the controller outputs a signal corresponding to a halftone dot area rate predetermined of a halftone dot to be recorded, per each color, to an exposure amount controller which varies the brightness corresponding to the halftone dot area rate depending on the signal output from the controller, and wherein an exposure head scans a recording film and records a reproduction picture thereon according to the halftone dot area rate in synchronization with the pickup head. This device is capable of performing an accurate and quick operation without any skill.

Tint laying device for use in a picture reproducing machine

A sharpness emphasizing method and machine used in a picture reproducing machine such as a color separator, wherein a sharpness emphasizing signal is prepared from a main signal and an unsharp signal, which are obtained by scanning an original picture, in a sharpness emphasizing signal circuit, wherein a corrected sharpness emphasizing signal is selectively produced from the sharpness emphasizing signal depending on the leap of the unsharp signal in a sharpness emphasizing component pickup circuit, and wherein the corrected sharpness emphasizing signal is added to the main signal in a composer circuit, thereby obtaining a picture signal whose sharpness is emphasized in its detail portions.

Sharpness emphasizing method and machine used in a picture reproducing

A color scanner comprising an original picture cylinder, a scanning head, a reproduction picture cylinder, and a recording head; and said device having several parallel frame plates with holes simultaneously bored through them in the same relative positions, bearings mounted to the holes, and guide shafts and bearing shafts mounted in the bearings. A single feed screw mounted through said openings in at least some of said frame plates moving the scanning and recording heads synchronously in the axial direction of the cylinders.

Color scanner for plate making

A method for carrying out a color correction in a digital manner in a picture reproducing machine such as a color scanner, a color facsimile, or the like, which is capable of saving a large volume of capacity of a memory, wherein a resultant value obtained from a combination of color separation signals which are obtained by scanning photoelectrically a color original picture, is represented in a plane coordinate system, and wherein the coordinates of the resultant value are transformed in order to correct hue and saturation by operating the color separation signals together with factors predetermined, thereby obtaining a combination of color-corrected color separation signals.

Digital color correction method

A picture scanner using a light beam which has first passed through a mask plate to scan a picture fixed to a revolving cylinder is provided with a system for adjusting the transverse position of the light source, consisting of a mirror which can be pivoted into the path of the light beam, a screen on which an image of the light source and an image of the mask plate can be simultaneously projected, and means for focusing both these images into the same plane.

Growing community of inventors

Kyoto, Japan

Hitomi Atoji