Dai Nippon Insatsu Kabushiki Kaisha

Dai Nippon Printing Co., Ltd.

Ikegami Tsushinki Co., Ltd.

Dai Nippon Insatsu K.k.

Satoru Horiguchi

Takeshi Sasaoka

Shinichi Amemiya

Hiroyuki Obata

Hideo Takeuchi

Yuji Homma

Mikizo Mizuno

Takashi Uchiyama

Koichi Shimane

Tetsuya Sakamoto

Tsunehiko Imamoto

Hiroshi Harima

Kenichi Mizuno

Shigeru Mogi

Tsuguo Yaguchi

Kazuhiko Sano

Ryuzo Tamaki

There are disclosed a method of delivering pictorial image data per each color obtained by applying color resolution to a manuscript using a color scanner to a sublimation transfer printer to effect a transfer from a sublimation transfer sheet to an image-receiving sheet, thus to make a hard copy of a color image, and a device for implementing such a method. The image data comprises three primary data of cyan, magenta and yellow and black data calculated from the three primary data. Data obtained by applying color and gradation corrections to the four color data are delivered to the sublimation transfer printer. The sublimation transfer sheet is provided with a transfer ink layer of four colors of cyan, magenta, yellow and black. By the operation of the sublimation transfer printer, the ink of each transfer ink layer is transferred onto the image-receiving paper, thus to make a hard copy.

Multicolor sublimation type thermal recording method including color and

Print inspecting method and apparatus

An inspecting liquid is dropped onto a resist layer formed on a gravure printing plate and is allowed to permeate the resist layer or gelatin resist layer to reach the printing plate so that a short circuit is formed between the inspecting liquid and the printing plate. The time required for forming the short circuit in the resist layer is measured by utilizing an oscillator pulse counting circuit to determine the conditions of the resist layer thereby to improve the quality of the finished printing plate.

Device for testing a resist layer on a gravure printing plate

In a plural-sheet detector for a printing machine, which detects the number of sheets piled as the number of serial pulse signals, in which whenever the serial pulse signals are detected, the count value is provided, the count value being compared with a reference count value to provide a deviation value representative of the difference therebetween, and the deviation value is compared with a reference deviation value, so that when the deviation value is larger than the reference deviation value, the number of sheets is determined unacceptable.

Plural-sheet detector

A device for fixing by suction a printing plate comprises: a casing whose interior is partitioned into a large number of compartments having open front faces; a perforated punching plate fixed to the casing to cover the open front faces of all compartments; a valve device mounted on a valve port formed on the rear side of each compartment; and a negative pressure source connected by way of the valve ports to respective compartments and applying suction to all valve devices, whereby the printing plate placed on the punching plate is fixed by suction tightly thereagainst.

Device for fixing by suction an offset printing plate or like plate in

A system in which data for controlling amounts of ink for a number of printing machines, having a variety of printing plates, are measured with one measuring device. This invention provides a printing image area measuring device which can detect a printing image area with high accuracy even if the surface of a printing plate is uneven, which device is simple in construction, low in manufacturing cost and high in measurement accuracy, and which can provide in-line automatic measurement in a printing line.

Offset printing plate printing image area measuring device

A calibration method is disclosed for a device in which an offset printing plate is optically scanned to measure the picture pattern area of the printing plate from the quantity of light reflected therefrom in which average values are obtained by scanning the printing plate plural times. The maximum and minimum of the average values are selected respectively as the quantity of light reflected from the non-printing-image region of the printing plate and as the quantity of light reflected from the printing image region of the printing plate in order to perform the calibration.

Calibration method for printing plate picture pattern area meter

An inspecting liquid is dropped onto a resist layer formed on a gravure printing plate and is allowed to permeate the resist layer to reach the printing plate so that a short circuit is formed between the inspecting liquid and the printing plate. The time required for forming the short circuit is measured to determine the conditions of the resist layer thereby to improve the quality of the finished printing plate.

Method of inspecting a resist layer on a gravure printing plate, and

An apparatus for simulating a color printing process comprises a scanning unit including a table on which four color separation films formed from a color original are placed side by side, a pair of flying spot scanner tubes, four lens systems for projecting raster images of the scanner tubes onto the four color separation films and four photomultipliers for converting light rays passing through the respective films into subtractive primary color signals of cyan, magenta, yellow and black; a control unit for effecting various adjustments and correction upon the color signals and including a zero adjuster, an after image corrector, a continuous tone gamma corrector, a screen gamma corrector, a soft/hard corrector, a negative/positive corrector, a flat etching device, a contrast adjuster, a light adjuster, a shadow adjuster and a partial adjuster; a color reproduction process unit for converting the adjusted and corrected subtractive primary color signals into additive primary color image signals of red, green and blue; and a color monitor unit for receiving the additive primary color image signals and including a color cathode ray tube for displaying a color image. The color cathode ray tube has a chrominance characteristic which can completely display the actual printing colors and has about 700 to 800 scanning lines per frame.

Apparatus for simulating color printing process

A flying spot scanner for use in a color printing process simulating apparatus for scanning yellow, magenta, cyan and black separation films formed from a color original a color image of which is to be displayed on a color monitor. The flying spot scanner comprises a flat stage having rectangular transparent sections arranged side by side with their long sides adjacent to each other for receiving the color separation films; first and second cathode ray tubes for producing first and second scanning rasters, respectively arranged above the middle point of the first and second films and the middle point of the third and fourth films, respectively; first and second lens systems for projecting images of the first scanning raster produced on the first cathode ray tube onto the first and second color separation films, respectively; and third and fourth lens systems for projecting images of the second scanning raster of the second cathode ray tube onto the third and fourth color separation films, respectively. By driving the first and second flying spot tubes in synchronism with each other, the four color separation films are simultaneously scanned with rasters having very small distortional errors.

Flying spot scanner for use in a color printing process simulating

In a color reproduction method for reproducing a color image on a color monitor screen by processing primary color signals of cyan, magenta, yellow and black which are derived by scanning color separation films of cyan, magenta, yellow and black, respectively, on the basis of the Neugebauer equations, at first the primary color signals of cyan, magenta and yellow are processed in accordance with specially derived color reproduction equations representing halftone of three additive primary colors of red, green and blue to produce three secondary color signals and a tertiary color signal, and then amplitudes of a paper color signal, the primary color signals, the secondary color signals, the tertiary color signal and the primary color signal of black are adjusted in this order independently from each other. An apparatus for carrying out the above color reproduction method comprises seven multipliers, four inverters and twenty seven variable resistors and by suitably adjusting the variable resistors the colors of the image displayed on the color monitor can be controlled.

Growing community of inventors

Saitama, Japan

Satoru Horiguchi