JPH02247664A - Color original copying method - Google Patents

Abstract

PURPOSE:To complement light colored parts and to obtain a clear color copy almost the same as an original by overlapping and copying the color original with a film for copying, which is a transparent polyester film, etc., colored with crimson or indigo blue or the mixed color of the two. CONSTITUTION:On an original platen glass of a color copying machine, the films for copying 2 and 2', which are transparent plastic films, the polyester films, etc., colored by directly printing or directly coloring using ink of the light crimson or the light indigo blue at every film or by the ink of the mixed light color of the crimson and the indigo blue, are singly or doubly placed as necessary, then, the color original 1 is placed on the film or films and the copying is performed. Thus, the light colored parts of the color original 1, expecially the red and the blue parts are complemented and the clear image almost the same as the color original 1 is reproduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for copying color originals suitable for use in reflective original printing during industrial plate-making or use in general office and home color copying machines. Regarding.

[Conventional technology]

Conventional color scanners scan colored originals and electronically perform three-color separation and correction to create negative or positive film, or electrostatic transfer of colored originals set on a platen. In a color copy machine that transfers onto paper supplied by a method, the colored original (original image) that is placed on the circumference of the scanner's original cylinder or on the flat document table of the color copy machine must be prepared using any special means. Either they were set directly and copied without being colored, or they were copied by overlaying a transparent plastic film on top of the colored original.

[Problem to be solved by the invention]

By the way, with the above-mentioned conventional color original copying method, the light colored parts of the color original (original image), especially the red or blue, are not well captured and only extremely unclear images are obtained, both in the case of printing and in the case of color copying. There is.

The present invention aims to solve the above-mentioned problems and provide a new color document copying method that can obtain clear images.

(Means for Solving the Problems) For this reason, the color document copying method of the present invention applies red or indigo red to each sheet of transparent plastic film or polyester film, or A thin mixed color of red and indigo is printed directly on a film using ink or dyed directly onto the film, and the film is overlaid on a color original (original image) and copied using appropriate copying means. It is a feature.

[Effect]

Originally, when reproducing color, an image is composed of halftone dots in four colors: red, indigo, yellow, and black, but the above-mentioned color original copying method of the present invention reproduces colors that are so light that they are visible or invisible to the naked eye. Conventional copying is possible by overlaying a film base made by coloring a transparent plastic film, polyester film, etc. in red or indigo, or a mixture of both colors, on a color original and operating a color copying machine or color scanner. The light colored parts (particularly red and blue) of a color original that could not be reproduced on colored copy paper, are reproduced in the original because the film base used in the present invention has complementary light colors. You can get very close and clear color copies.

Furthermore, if you want to produce a color that is closer to that of a color original, or if you want to produce a desired tone, you can use a single film base colored by mixing red and indigo, and then apply red or indigo individually to each film. By using colored film bases in layers, it is also possible to add complementary colors to colors that are lacking in a color original. Note that if necessary, it is also possible to interpose a yellow colored film base in the middle of the film to compensate for the light color.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
Figures 1 (a) and (b) are perspective views showing how the copying film is used, Figure 2 is an overall view of a color copying machine that uses the method of the present invention, and Figure 3 is how the copying machine is used. FIG. 4 is an explanatory diagram showing how a color document and a copying film are attached in a color scanner, FIG. 5 is an overall view of the color scanner, and FIG. 6 is an explanatory diagram of the operation of the color scanner.

In these figures, a light color of red or indigo is applied individually to each sheet of film, or a mixture of both colors is applied to a flexible film such as a transparent plastic film used in the color document copying method of the present invention. When using the copying film 2゜2', which is colored in one film, in the color copying machine shown in Figs. Copying film 2 or 2 sheets if necessary
After placing , place color original (original image) 1 on top of it,
By closing the document table cover 5 and operating the color copying machine using conventionally known means of using the device, the paper feed section ? Copy paper fed from the upper cassette 8 or lower cassette 9
The paper is supplied from the tray 10, sent to the transfer unit 10 through the conveyance unit 11, where it is electrostatically transferred, and then discharged from the tray 10. Note that 6 indicates a part of the scanner.

Next, a description will be given of FIGS. 4 to 6 showing examples of the case where the method of the present invention is applied to a color scanner. FIG. The fixing film 3 is further wound around the outer periphery and set on the cylinder 13, and FIGS. 5 and 6 are explanatory diagrams of its structure and functions.

The color original l is placed in the original cylinder 1 as shown in Figure 5.6.
3, the colored copying film 2 of the present invention is further placed on top of it as shown in FIG. It is fixed at 13. The original cylinder 13 is made of a glass cylinder and shines a spot light smaller than that of the light source 12 onto the color original 1 and the colored copying film 2 set over the original, separates the transmitted light or reflected light into three colors, and separates the transmitted light or reflected light into three colors. The intensity of the light received by the phototube is converted into the intensity of current, which is input to the computer 14 for color correction and gradation correction.

The current leaving the computer 14 enters a laser 18 which illuminates a small beam of raw film 17 wound around the circumference of the recording cylinder 16. The scanning spot light travels through the color original 1 and the copying film 2 attached thereto while sequentially breaking it into points. 19 is the digital control section,
20 is a keyboard.

Next, examples of the coloring density of plastic films and polyester films in the method of the present invention are shown below.

■ Concentration mixed with crimson and indigo is used for printing ink. Ink used: crimson, Zincash red pigment. ■ Super light-fast ink used: indigo, cyanine blue pigment used. The densities of the printing ink are as follows for the case of a yellow colored film interposed as necessary between each film of colored red, indigo, or a mixture of both.

■ Base composed only of yellow In the present invention, lighting materials are used as coloring materials. A colored film base can also produce a similar effect on a color direct scanner plate making machine for full color printing.

Although one embodiment of the present invention has been described in detail above, it goes without saying that the present invention is not limited to the embodiment described above, and can be implemented in various ways within the scope of the technical idea of the present invention. do not have.

〔Effect of the invention〕

As described above, according to the color original copying method of the present invention, pale colored parts (particularly red and evening colored parts) of a color original, which were unclear using conventional color original copying techniques, can be reproduced in red or red on a polyester film or the like. The special use of copying film colored with indigo or a mixture thereof makes it possible to use complementary colors that are lighter than traps, reproducing clear images that are extremely close to the color original (original image), and producing high-quality color copies. It has become possible. In addition, it is easy to use, and the cost is extremely low compared to color printing, making it highly economical.

[Brief explanation of drawings]

Figures 1 (a) and (b) are perspective views of the copying film in use according to the present invention, Figure 2 is an overall view of a color copying machine used in the method of the present invention, and Figure 3 is an explanatory diagram of the same use status. , 4th
The figure is an explanatory diagram of how a color original and a copying film are attached in a color scanner, FIG. 5 is an overall diagram of the color scanner used in the present invention, and FIG. 6 is an explanatory diagram of the operation of the color scanner. l...color original, 2.2'...copying film,
3...Fixing film, 4...Original table glass, 5.
...Document table cover 13...Document cylinder, 16...
- Recording cylinder. 83 prisoner 4 same

Claims (1)

[Claims] (1) Print a light color of red or blue on each sheet of transparent plastic film or polyester film, etc., or directly print a light color of red and blue on one sheet of the film using ink. 1. A method for copying a color original, which comprises dyeing the film directly or directly dyeing the film, overlaying the film on a color original, and copying the film using an appropriate copying device.