JPS6384378A - Printer device for dot decomposed film formation - Google Patents

Abstract

PURPOSE:To form a dot decomposed positive which is usable for offset printing by printing stored image information on a film in dots by pieces of image information corresponding to Y, M, and C together with read positioning marks. CONSTITUTION:A print control part 6 outputs a positioning mark comment information generation command D10 to a positioning mark comment generation part 4. A positioning mark and comment information D8 are outputted from a ROM that the generation part 4 is equipped with to a printer mechanism part 5 in response to the signal D10. A control part 6, on the other hand, outputs a readout command signal D4 to an image information storage part 2 and image information D5 corresponding to, for example, Y is read out of the storage part 2 and sent to an area gradation processing part 3. The processing part 3 simulates density and sends out binarization image information D7 to a mechanism part 7. The mechanism part 5 prints the image information corresponding to the Y(Yellow) of a color original in dots based on the information D7 to obtain a dot decomposed positive.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to printer loading, and particularly to a printer device for producing a net-resolved positive film (hereinafter referred to as a net-resolved positive) for offset printing.

[Prior art]

For example, color printing by conventional offset printing is performed through the following steps.

(First step) Color correction, tone correction This color correction and tone correction are the steps to create color separation negatives, which will be described below, in order to reproduce and print the image appearing on the color manuscript in its most natural state. , Y (yellow) M (red) C
This is a creation process that artificially selects the optimal decomposition filter corresponding to each of the (blue) colors.

(Second step) Color separation negative production Using the Y (yellow), M (red), and C (blue) color separation filters selected in the first step, the above Y, M,
This is a work process for making color separation negative films corresponding to C.

(Third step) Preparation of net-resolved positive In this step, Y and M produced in the second step above.

A contact screen is placed over each of the color separation negatives corresponding to C and K, and an unexposed film is brought into close contact with the lower surface of the color separation negative.
, C, and K, respectively, are exposed to the unexposed film.

Positive films produced in this way corresponding to Y, M, C, and K, respectively, are called net-resolved positives (mesh positives).

(Fourth step) Lithography printing is a work Y, M, and C produced in the third step above.

Four types of reticulated positives corresponding to K are each polymerized on a PS plate (a plate coated with a photosensitive liquid) and each is exposed to ultraviolet light. As a result, some parts are exposed to ultraviolet rays and others are not, and their properties change chemically.
It becomes possible to remove areas exposed to ultraviolet rays by chemical treatment, washing with water, etc. without washing them off. This work process is the fourth process.

(Fifth step) Lithographic printing production work Fourth] The PS board that has been baked with ultraviolet rays in the second culm is subjected to chemical treatment, washing with water, etc., thereby washing away the portions exposed to ultraviolet rays. Only the portions that were not exposed to ultraviolet light are left behind, and the resulting plate is a printing plate. The process of producing a printing plate in this way is the 51st step. For color printing, four types of printing plates are produced: Y, M, and C.

The printing plates made through the steps described above are sequentially positioned at the same position on the paper to be printed, and printed four times with each ink (yellow, red, blue, black) to print in color. It is being done.

[Problems that the invention attempts to solve]

For example, in color printing using conventional offset printing described above, in order to produce a halftone separation positive in the third step, the color separation negative production step described as the second step is required. These processes are so-called photographic processes (using light to expose unexposed film), so they take time,
This is expensive and labor-intensive, and has been a bottleneck in efforts to shorten printing time and reduce costs. In addition, the size of the net-separated positive needs to correspond to the size of the printed matter in a one-to-one ratio, and this is a process that requires labor-saving in order to increase work efficiency.

The present invention has been made in view of the above-mentioned problems,
SUMMARY OF THE INVENTION An object of the present invention is to provide a printing apparatus for producing a mesh separation positive, which can produce a mesh separation positive by directly printing the mesh separation positive onto a film using a dot printer.

[Means for solving problems]

The present invention comprises an input/output interface, an image information storage means, a gradation expression means, a printer mechanism, a print control section for controlling them, etc., and reads the image information stored in the image information storage means. In the printer for printing, a storage means for storing alignment mark information;
reading means for reading the alignment mark from the storage means;
The image information corresponding to at least Y (yellow), M (red), and C (blue) of the printed original and stored in the image information storage means is recorded on the film for each of the image information corresponding to Y, M, and C, respectively. and printing means for dot printing together with the registration mark read by the reading means, thereby creating a halftone separation positive that can be used for offset printing.

[For production]

According to the invention, at least Y for the original document.

Print the image information corresponding to M and C together with the alignment mark,
Since it creates halftone separation positives that can be used in offset printing, it does not require the time and effort required to create halftone separation positives using a photographic process using color separation negatives, reducing costs. .

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the same embodiment. In this figure, Dl is input to the input section 1 as a signal consisting of image information corresponding to R, G, and B color components, respectively. The input section 1 is the above-mentioned R and G.

A conversion circuit that converts image information corresponding to each of the B color components to Y, M, and C or Y, M, and C color components, and an input register that temporarily stores input signal 01. It is equipped with a circuit, etc. (not shown above).

2 is an image information storage unit, which is equipped with an image information storage RAM, and storage areas for image information corresponding to the color components of Y (yellow), M (red), C (blue), and K (black) are set in advance. has been done. This storage area is configured as shown in FIG. 4, for example.

That is, 20 shows the conceptual structure of the storage area, in which image information corresponding to Y (yellow) for each pixel when the color IIM is decomposed into a matrix is stored at the corresponding address. 21 is a storage area for image information corresponding to M (red), 22 is a storage area for image information corresponding to C (blue), and 23 is a storage area for image information corresponding to K (black).

3 is an area gradation processing section, and Y, M of the image information storage section 2
A comparator compares each image information sequentially read out from an area where image information corresponding to , C, and K is stored based on a preset threshold, and the results of the comparison by the comparator are It is composed of an output circuit (not shown) that outputs binary information of 1j or "0" to the printer mechanism section 5.

4 is a registration mark and a comment generation part, which are necessary for offset printing, and are necessary for distinguishing between halftone separation positive films (for example, rY for halftone separation positive corresponding to Y (yellow)).
The letter J, the letter rMJ for the net resolution positive corresponding to M (red), etc.) comment information 08 at the optimal timing,
The image is output to the printer mechanism section 5 in the same manner as the area gradation processing section 3 described above. Therefore, the alignment mark comment generation section 4 contains the RO in which alignment marks or comment information is stored.
It is equipped with M.

The printer mechanism section 6 constitutes a dot printer, and as shown in FIG. 2, its structure is similar to that of a well-known printer using a thermal head. Then, the printer mechanism section 5 converts the binarized image information D7 corresponding to Y, M, C, and K sent from the area gradation processing section 3 into four Dot printing is performed using a single color, black, using four types of halftone separation positives corresponding to color-separated color originals. Four types of halftone separation positives printed by the printer mechanism 5 are shown in FIG. That is, 14 is a transparent film, 15 is an outer transparent film 14
Halftone separation positive corresponding to K (black) printed on , 16 is C
17 is a halftone separation positive corresponding to M (red), and 18 is a halftone separation positive corresponding to Y (yellow). In addition, 19a is a 1+"-shaped alignment mark, and the printer mechanism 5
Printed by 19b to 19e are comments added to each mesh separation positive printed by the printer mechanism 5, similar to the alignment marks described above.

6 is a print control section, which is connected to the input section 1 mentioned above.
, image information storage section 2, area 111! A ROM storing a program for controlling the im processing section 3, the printer mechanism section 5, and the alignment mark comment generation section 4, and the control section 11.
111 program, the central processing unit (CPU) that controls the input unit 1, image processing storage unit 2, etc., and other external inputs specifying the type of print 1 to be performed by the printer mechanism unit. A human output interface, etc. that inputs and outputs display data, etc. for displaying on an external display device (designation information on whether to print in color, black and white print 1~, or halftone separation positive print), etc. (not shown).

Next, the operation of this embodiment will be described with reference to FIG.

First, the mode specification is [Network separation positive 1 is specified]. Next, image information 1]1 is input to the input section 1. The input information is R,G.

If it is B, it is converted into image information corresponding to Y, M, and C in the conversion circuit 1113. Furthermore, Y, M.

For the image information corresponding to C, undercolor removal (Y, M.

(Extracting the logical product part between the image information corresponding to C) to create image information corresponding to K (black), and further correspond to the image information corresponding to Y, M, and C above and K (black) above. Y in the image information storage section 2 is determined by calculating the difference between the image information and the image information corresponding to K above as new image information D3.

It is stored in storage areas 20 to 23 of M, C, and M.

These processes are performed in the conversion circuit included in the input section 1 and the image information storage section 2 based on command information D2 and D4 from the CPU of the print control section 6.

Next, the CPU outputs a match mark and comment information generation command D10 to the match mark and comment generation section 4. In response to this command signal DID, the alignment mark and comment information D8 are outputted from the ROM included in the alignment mark and comment generating section 4 to the printer mechanism section 5. The printer mechanism section 5 prints the alignment mark and comment information D8 at a predetermined position in response to a print command signal D9 output from the CPU (see FIG. 3). Next, C
PU is a read command signal D of image information corresponding to Y (yellow) stored in the image information storage area 20 shown in FIG.
4 is output to the image information storage section 2.

As a result, the image information D5 corresponding to Y stored in the image information storage area 20 is sequentially read out and sent to the plane@gradation processing section 3.

The area gradation processing section 3 performs a well-known pseudo-shading process such as a dither method. The thus processed image information D5 corresponding to Y is binarized, and this binarized image information D7 is sent to the printer mechanism section 5. Printer mechanism section 5
Then, dot printing is performed based on the binarized image information D7. In this way, the image information corresponding to Y (yellow) of the color original is printed as a halftone separation positive corresponding to Y, and when this printing is completed, the CPU issues a registration mark generation command to the comment generating section 4 to generate registration marks again. Outputs signal D10. Therefore, the printer mechanism 5 prints an alignment mark 19a (see FIG. 3) at a predetermined position on the halftone separation positive corresponding to Y (yellow) of the color original.

When the printing of the halftone separation positive corresponding to Y (yellow) is completed, including the printing of alignment marks and comments, the CPU moves the pull-out rollers 12a and 1 shown in FIG.
2b is rotated and the film 13 is pulled out a certain length in preparation for printing the next image information corresponding to M (red). Then, by repeating the same operation as printing the halftone separation positive corresponding to Y (yellow) mentioned above, the following M (red), C (blue), and K (black) are printed.
Corresponding halftone separation positives are printed on the film 13 in this order.

As described above, in this embodiment, the halftone separation positive film required for offset printing can be directly printed using a dot printer.

〔Effect of the invention〕

According to the present invention, a positive halftone separation film that can be used for offset printing can be directly produced without the need for a color separation negative production process and a photographic process using the color separation negative. It is possible to reduce the cost required to create the , and also shorten the time required to create the .

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram of a printer device for producing a reticulated film according to the present invention, FIG. 2 is a schematic configuration diagram of the printer mechanism section 5 in the block configuration diagram shown in FIG. 1, and FIG. FIG. 4 shows Y of the image information storage unit 2 in the block diagram shown in FIG. 1. FIG. 2 is a conceptual configuration diagram showing predetermined storage areas corresponding to M, C, and K, respectively. 2... Image information storage unit, 3... Area gradation processing unit, 4... Alignment mark, comment generation unit, 5...
... Printer mechanism section, 6... Print control section.

Claims (1)

[Claims] A printer comprising an input/output interface, an image information storage means, a gradation expression means, a printer mechanism, a print control section for controlling them, etc., and reads and prints image information stored in the image information storage means. ,
a storage means for storing alignment mark information; a reading means for reading out the alignment mark from the storage means; and a reading means for reading out the alignment mark from the storage means; The image information stored in the storage means, Y,
A halftone separation positive that can be used for offset printing, comprising a printing means for printing dots on the film together with alignment marks read by the reading means for each of the image information corresponding to M and C, respectively. A printer device that makes it possible to create reticulated film.