JPS61183652A - Manufacture of color separation film and its device - Google Patents

Abstract

PURPOSE:To manufacture easily a color separation film by superposing a white reflecting sheet for designating a trimming area of an original picture, on the original picture, deriving a color separation image by scanning the inside of the area, and forming a mask by scanning other part than the window by other optical system. CONSTITUTION:An original picture 16 and a white sticking mount 21 which has cut trimming windows 16'a, 16'b of the original picture are wound in layers to an input cylinder 2. The input cylinder 2 and a recording cylinder 7 are rotated simultaneously by a shaft 11. A photoelectric converting part 13 of an input head 3 converts photoelectrically a beam of light from the windows 16'a, 16'b by a transmission use light source 15, executes a picture signal processing 17 and inputs a signal g2 to a gate 18. A photoelectric converting part 14 converts photoelectrically a beam of light of a reflection use light source 20, which has been reflected by the sticking mount 21, inputs it to a comparator and binary-codes it and inputs a signal e2 to the gate 18. The gate 18 makes the signal g2 pass through to a recording head 8 as it is when the signal e2 is L, and when the signal e2 is H, the maximum level g3 is sent and blackened after a development. In this way, a mask is formed exactly, and a color separation film can be manufactured easily.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to printing plate making technology using a color scanner. The present invention relates to a method and apparatus for producing a color separation film, in which a mask area that functions as a cutout mask is exposed to light while recording an image.

(Prior art) In recent plate-making processes, the process of creating printing plates and block copies has been streamlined, and layout scanners that perform most of this process electronically have come into use in some areas. .

However, the conventional method of creating a color separated image using a conventional color scanner and then performing a manual operation and a contact exposure operation to perform pasting and collection is still widely used.

In order to simplify the work of pasting collections, the color originals themselves are pasted onto a mount according to the required layout, the pasted color page originals are prepared, and then scanned with a color scanner. Some methods have been used to color separate the pages all at once (for example, see Japanese Patent Laid-Open No. 59-226348).

For example, as shown in FIG. 6, the input cylinder (A) of a color scanner contains an original picture (B+) that requires color separation and shading based on a designated layout.

(B2) and (B3) are pasted onto the pasting mount (C) and set in the input cylinder (A), and the original designs (Bl), (B2), and (B3) are printed at the same size. Then, the images are color-separated and shaded onto the recording film (E) on the recording cylinder (D), and recorded as a mesh negative image.

In this case, the original drawings (Bl), (B2), and (B3) are created using a duplex camera using a duplex camera from the original originals such as color film, or on color duplex film or color photographic paper, at the magnification specified when creating the layout drawing. A second original image that has been reproduced in advance is used, and at that time, the original images are pasted onto a single pasting mount (C) (transparent film or blank paper with register marks, etc. as necessary). has a well-balanced gradation, etc. to facilitate simultaneous processing with a color scanner.

Furthermore, in order to collect letters, line drawings, etc. together with the images, it is necessary to use a line-art base negative (F) for those letters and line drawings.
), and also create a trimming mask (G) that makes the trimming area of the pattern transparent like a window and the rest opaque, and then add [1] to a new film (H). ] Pattern negative (E') and cutout mask (G
) and [2] line drawing negative (F)
It is necessary to go through the process of double contact exposure to obtain a finished positive image (J).

This multiple contact exposure process requires accurate alignment, and especially when a layout that does not make the boundaries between patterns noticeable, commonly known as tweezing, requires multiple mask plates. A high degree of accuracy is required for alignment between the two.

In addition, a second original image is created in advance on a color duplication film from the original original image, cut to the size of the required trimming frame, pasted on a transparent sheet, and wrapped around an original cylinder with the original image inside. There is a way to perform scanning.

However, this method has practical difficulties in that it is difficult to accurately crop the required cropping area of the second original image to the required cropping size, and the specified cropping frame cannot be changed after color separation. If there was,
This involves the trouble of having to start over again from the creation of the second original image.

Furthermore, in Japanese Patent Application Laid-Open No. 59-226348, the present applicant has proposed to produce a one-color separation film by recording a pattern with a necessary rectangular mask along with text and line drawings in a rectangular trimming area. Disclosed.

However, this disclosure does not include recording a pattern given a mask of an arbitrary figure.

(Problems to be Solved by the Present Invention) The present invention provides the above-mentioned contact printing method for overlapping films in a multiple exposure process using a printer, at least for color separation negatives, characters, line drawings, etc. Negatives can only be pre-made by color scanners, even if complex shapes.

The purpose is to record only required images trimmed with high precision.

(Technical means for solving the problem) One aspect of the present invention is that when one or more original images that require trimming are color-separated by a color scanner to create a color separation film, the trimming area of the original image is divided. By providing a trimming window for trimming, attaching the original image corresponding to the trimming area to a sheet member with high surface reflectance, attaching the sheet member with the original image attached to the input cylinder with the original image on the inside, and scanning it. , the color-separated image of the original image within the trimming window detected by the first photoelectric conversion means that separates the original image using white light in the visible region as a light source is recorded on the photosensitive material on the recording cylinder, and the first photoelectric converter By projecting a light beam separable from the white light onto the scanning point of the conversion means, the area of the surface of the remaining portion of the sheet member outside the trimming window detected by the second photoelectric conversion means is transferred to the photosensitive material. It is to record blackness.

The present invention also provides light source light for color separation and light source light for binary separation, means for discriminating the two types of light source light, and a photoelectric conversion unit for the light source light discriminated into two types, When the output of the second photoelectric conversion section for value separation is small, the output from the first photoelectric conversion section for color separation is changed, and when the output of the second photoelectric conversion section is large, the output of the second photoelectric conversion section is The present invention also relates to a color separation film producing apparatus that includes a recording head that records output according to the output.

(Basic Principle of the Invention) Although detailed explanation will be given in Examples, the basic principle of one invention will be briefly explained first.

Peel-off film with light-shielding properties (for example, JP-A-57-
124351), the trimming area is cut out, and the original image is superimposed on the trimming area.

By scanning and receiving infrared light on the portion where the beer layer remains, the area outside the trimming area is detected. In the trimmed area where no beer layer remains, there is little reflection of infrared light, so it is detected as an image area.

The image area is scanned with white light, and when receiving light, a filter that blocks infrared light is used to receive only white light, and color separation scanning is performed in the conventional manner.

For example, the area outside the trimming area is subjected to solid exposure, and the area inside the trimming area is exposed to color separation.

(Configuration of Embodiment) FIG. 1 shows the configuration of a color scanner according to the present invention, which includes an input section (1), an input cylinder (2), an input head (3), and an input head (3). sub-scanning feed screw (4
) and a motor (5) that drives the feed screw (4),
The recording unit (6) includes a recording cylinder (7), a recording head (8) using a dot generator system, and a recording head (8).
) and a motor (10) for driving the feed screw (9).

The input cylinder (2) and the recording cylinder (7) are rotated by a motor (12) that drives a common rotation shaft (11), and this rotation causes the input cylinder (1) and the recording cylinder (6) to rotate. A scan is performed.

The input head (3) includes a first photoelectric conversion unit (13) for original image scanning that simultaneously detects light transmittance and light reflectance on the same scanning point, and an original image that has a trimming area defined according to the present invention. Two pickup means are provided for the second photoelectric conversion section (14) for scanning the surface of the pasted sheet member.

The first photoelectric conversion unit (13) includes a transmission light source (
15) photoelectrically scans the original image (16a) (16b) of the original image to be scanned (16) attached to the peripheral surface of the input cylinder (2), and generates the conventional three-color signals of red, green, and blue ( R
, G, B) and an unsharp signal (U) for emphasizing the outline. This color separated image signal (gl) is input to an image signal processing circuit (17) that performs masking, color correction, gradation correction, etc., as in the conventional art.

By sending the output signal (g2) of the image signal processing circuit (17) as it is to the recording head (8), a conventional color-separated duplicate image is recorded.

The output signal (g2) of this image signal processing circuit (17) is
sent to the recording head (8) via the gate (18);
If the other input of this gate (18) is rLJ, a conventional color separation image is recorded on the photosensitive material (19) installed in the recording section (6).

The second photoelectric conversion unit (14) includes a reflection light source (20) for scanning the trimming area, and includes an original image (16a) (16b).
) on which the original image to be scanned (16) is pasted (
The surface of 21) is photoelectrically scanned, and the output signal (e) is
A comparator (22) converts it into a 2-short signal (e2) expressed in binary levels.

The two short signals (e2) output by the comparator (22) are:

input to the gate (18) and the image signal processing circuit (1
Pass or block the output signal (g2) of 7).

The output rHJ of the 2-short signal (e2) causes the gate (18) to output the output signal (g3), and causes the recording head (8) to output the maximum level of exposure light amount. This amount of exposure light is used to expose the photosensitive material (19) so that it can be blackened so that it has a light-shielding property after development.

In addition, when the 2 short signal (e2) is "L", the gate (
18), the output signal (g2) passes through as is.

It is output as an output signal (g3) and sent to the image signal processing circuit (
17) is recorded with a dot area ratio corresponding to the level of only the output signal (g2).

FIG. 2 is a principle diagram illustrating a specific example of the first and second photoelectric conversion sections (13) and (14) in the input head (3).

The first photoelectric conversion section (13) is the same as the color separation photoelectric means used in conventional color scanners, etc., and this photoelectric conversion section (13) is a half mirror that branches the input optical path according to the required signal. -(310) (31R) (31G
) and mirror (31B), an aperture mask (33U) (33S) that determines the resolution of each signal, and a color separation filter (33S) provided in the optical path for the three color signals.
2R) (32G) (32B) and the light beam that passed through the color separation filter (32R) (32G) (32B),
Unsharp signal (U) and three color separation signals (R, G
, B) Light receiving element (34U) (34R) that performs photoelectric conversion
(34G) (34B).

The light from the transmission light source (15) of this first photoelectric conversion unit (13) is guided from inside the input cylinder (2), and the light from the light source (15) is guided from inside the input cylinder (2).
The output light beam of 5) emits white light (15a) in the visible range, and the white light (15a) passes through the mirror (35) to the original image (16a) attached to the surface of the input cylinder (2).
(16b) and enters the first photoelectric conversion unit (13) via the mirror (36).

Immediately after this light source (15) and immediately before the photoelectric conversion section (13), infrared cutoff filters (37) (38) are installed in each optical path.
is provided.

On the scanning point (P) where the optical path connecting the first photoelectric conversion unit (13) and the light source (15) intersects the original image to be scanned (16),
A reflection light source (20) irradiates infrared rays (20a) from outside the input cylinder (2), and the infrared reflected light (20a') on the scanning point (P) is transmitted to the first photoelectric conversion unit (1).
The first photoelectric conversion unit (13
) is branched by a half mirror (41) immediately before the infrared cutoff filter (38). Immediately after the reflective light source (20), the infrared wavelength of the light source (20) passes through, and Visible light blocking filter (42) that blocks white light in the visible range required for color separation
is provided.

In addition, a visible light blocking filter (43) with similar characteristics is
It is also provided immediately after the half mirror (41).

It is more preferable that the half mirror (41) has the property of transmitting visible light and reflecting infrared light.

The part after the half mirror (41) constitutes the second photoelectric conversion unit (14) according to the present invention, and includes a visible light blocking filter (43).
), the infrared rays (20a) pass through an aperture mask (44) having the same diameter as the color separation aperture mask (33S), and enter the light receiving element (45).

In this way, the first and second photoelectric conversion sections (13) (1
4) uses infrared cutoff filters (37) (38) and visible light cutoff filters (42) (43) to perform transmitted light photometry and reflected light photometry completely separately and simultaneously without disturbing each other's photometry systems. Photoelectrically scans the scanning point.

In the above explanation, white light and infrared light are separated, but it is also possible to separate white light and ultraviolet light, for example.

(Function of the embodiment) FIG. 3(a) shows the original image to be scanned (16) mounted on the input cylinder (2), that is, the pasting mount (21) on which the original images (16a) and (16b) are pasted. , is a plan view seen from the input head (3) side, and FIG. After copying and recording, it is assumed that the image has been developed.

FIG. 3 is a plan view seen from the recording head (8) side.

As shown in FIG. 4, which will be explained later, the pasting mount (21) includes a transparent film base (21a) with good light transmittance,
It is a sheet material made of polymerized white peel (21b) with high surface reflectance, and is provided with at least two register holes (21c) that align with register pins for accurate positioning.

The photosensitive material (19) also has approximately the same dimensions as the pasting mount (21), and this photosensitive material (19) is also provided with register holes (19a) corresponding to the register holes (21c). .

This register hole (21c) and register hole (19a)
The resistor pin that matches the input cylinder of the scanner (
2), recording cylinder (7), CAD (Comp
(Uter Aided Design) system, contact printing is provided with pin diameter and pitch common to printers and jigs for supporting one work. Such alignment means are conventional.

Detailed description will be omitted.

On the pasting mount (21), white beer is placed on the part where the required trimming area of the original picture (16a) (16b) is allocated based on the specified layout of the pasting collection (hereinafter referred to as the "complete bottom mount"). Trimming windows (24a) (24b) cut out of the layer (21b) are provided.

The process of cutting out the trimming windows (24a) and (24b) is not directly related to the features of the present invention, so the details thereof will be omitted, but they are almost the same as the process of cutting out the conventional red beer film.

However, when high precision is required such as tweezing,
It is preferable to accurately position and cut out the outline of the designated trimming area using a graphic processing technique such as a CAD system.

The original picture (16a) pasted on the pasting mount (21) (
In 16b), the required magnification for enlarging or reducing the first original image is determined in advance, and the second original image is created as a good duplex film image that combines one color tone, gradation, etc. at the corresponding magnification. Just use it.

Original picture (16a) on this pasting mount (21) (1
6b) is applied so that when the white peel layer (21b) is on the front side, the film surface of the original image (16a) (16b) is in contact with the cylinder (2) on the back side, which is the transparent film base (21a) side. Forward and original picture (16a) (
The trimming area of 16b) is the window hole (24a) (24
b), and are pasted with adhesive tape or the like.

This original picture (16a) (16b) is pasted on the mount (21)
) The pasting process is no different from the conventional work, and the conventional pasting mount made of a sheet material whose entire surface is transparent is replaced with the pasting mount having the white peel layer (21b) according to the present invention on its surface. (21).

FIG. 4 shows the color-separated image signal (gl) produced by the first photoelectric conversion unit (13) (however, one of the three channels, R, G, and B, is shown) and the color separation image signal (gl) produced by the first photoelectric conversion unit (13) and the color separation image signal (gl) produced by the first photoelectric conversion unit (
FIG. 4 is a diagram showing the output signal (ei) of I4) on the pasting mount (21) and the original image (16a) in correspondence with the mm-line cross-sectional view in FIG. 3;

The first photoelectric conversion section (13) includes a white peel layer (21
The original image (16a) inside the trimming window (24a) cut out in b) is exposed to the white light (15) of the transmission light source (15).
15a), the transmitted light (15a') that has passed through the original image (16a) is faithfully photoelectrically converted. The remaining portion of the white peel layer (21b) outside the trimming window (24a) is slightly translucent in the white peel layer (21b), so even if there is some leakage of transmitted light (15a), it is extremely is attenuated and detected (signal in Fig. 4 (
gl)) - The second photoelectric conversion section (14) includes a white peel layer (21
The reflected light (20a') of the remaining portion of b) is detected by the infrared rays (20a) of the reflected light source (20).

Trimming window (24a) through which the original picture (16a) can be seen
Is the infrared ray (20a) absorbed by the original image (16)?

Alternatively, since the reflected light (20a') passes through to the back surface, the sensitivity of the reflected light (20a') is significantly reduced and detected (signal (e) in FIG. 4).

The output level difference of the output signal (e) of the second photoelectric conversion section (14) is determined by the threshold of the comparator (22).
It is compared to a threshold value (shown as a dotted line) and converted to a clear binary level. The comparator (22) is connected to the gate (18)
The signal that gives the “H” level to the white peel layer (2
1b) when detecting the remaining surface of 2.
Create a value sign (e2).

As a result, the area (25) corresponding to the remaining part of the white peel layer (21b) in the output image shown in FIG.
) is constantly exposed to at least 100% dot area ratio or more, and when printing on another film or PS plate, etc. during multiple exposure, it sufficiently blocks the light rays and acts as a mask. It becomes possible to blacken at a density as high as possible (the signal (e2) part of the signal (g,) in FIG. 4).

In addition, the trimming area (26) through which the original images (16a) and (16b) can be seen in the trimming windows (24a) and (24b) is the area where the output signal (g
2) The mesh image (16a'
) (16b'') is recorded (signal (g
,) of the signal (g2) part).

The color separation film image (19') recorded and developed as described above is a mesh image (16a') (16b).
' ), a negative color-separated mesh image is formed, and the surrounding area is heavily blackened, so
The next step is contact printing using a printer, which can be used without the need for a cutout mask as in the conventional process.

In Fig. 4, loading the cylinder (2) is the original picture (1).
6a), the transparent film base (21a), and the white peel layer (21b), but if you can distinguish the difference in reflectance between the white peel layer (21b) and the original picture (16a), ), white peel layer (21b)
, transparent film base (21a), and
The direction of the film surface of the original image (16a) may also be on the white peel-off film side.

The above is a case where the original images (16a) and (16b) are transparent original images, but the present invention can also be applied to reflective original images.

That is, by setting the surface reflectance of the pasting mount (21) to be higher than the reflectance of the maximum surface reflection part (highlight point in the positive) in the reflective original, the comparator (22) can distinguish between the original and the reflective original. This is because the difference in the reflectance of the pasting mount can be discriminated.

Figure 5 (a) is a color separation film image (19') created as described above, and Figure 5 (b) is a negative image of letters, line drawings, and screen dots created separately from the complete stencil. The line drawing film image (27) of the same figure (c) shows the line drawing film image (27) of both films (19'
) (27) are double-printed onto other photosensitive materials through a printer for contact printing, and then developed to produce the final positive printing plate printing film master plate (2).
8).

Of course, it is also possible to double-print the color separation film image (19') and the line drawing film image (27) directly onto the 28 plate, in which case (28) becomes the printing plate.

In the printing process using this printer, there is no need to use a separate mask when printing the color separation film image (19'), and focus alignment is easy and work efficiency is improved.

According to the method of the present invention, in contact printing, two or more film materials are not overlapped at the same time during printer operation, so that the adhesion and workability are improved.

(Effects of the present invention) As described above, according to the present invention, when creating a color separation film using a color scanner, a color separation film similar to that used in the past using a red peel mask film required for post-processing can be used in one color separation film. Because the subsequent contact printing process involves overlapping film materials that require precision, the contact printing process is reduced, thereby improving the reliability and accuracy of contact printing, and improving the contact printing process. is simplified,
The workability can be improved.

Further, in the present invention, the first and second photoelectric conversion sections are as follows.

Since transmitted light photometry and reflected light photometry are performed independently on the same scanning point without mutual interference, the output image signals are
They can be obtained independently and without any time difference, which greatly facilitates the control of the recording head.

When recording with a dot generator, as disclosed in Japanese Patent Application No. 58-100236 by the present applicant, the photoelectric conversion unit (14) for detecting the trimming area is used as a line sensor, so that the trimming contour line can be detected. Needless to say, smooth duplication becomes possible.

When the gate (18) detects the surface of the white peel (21b), the recording head (8) records a dot area ratio of 0%, and when the trimming window (24a) (24b) is detected, it outputs a positive signal. The color separation signals (g,') can be sent to the recording head (8). As a result, a positive masked color separation image (for example, as shown in FIG. 4(C)) is exposed and recorded.

It is also possible to record on the mask portion at an arbitrary dot percentage given separately.

The present invention can also be implemented in scanners that use contact screens.

Although the embodiments have been described using a white peel-off film, it goes without saying that the present invention can be carried out by cutting out and using a material having the same function, such as a blank sheet of paper.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a color scanner to which the present invention is applied. FIG. 2 is an optical path diagram showing a specific example of the implementation principle of the photoelectric conversion section of the input head in FIG. 1. FIG. A plan view of the original to be scanned attached to the input section of the scanner and its output image, FIG. 4 is a plan view of the original to be scanned in FIG.
Fig. 5 is a diagram illustrating a color separation film obtained by the present invention;
A plan view of a separately obtained line drawing film and a printing plate film obtained as a result of multiple exposure of both films to a light-sensitive material. Figure 6 is a diagram showing the plate-making process using the conventional multiple exposure printing process. It is. (1) Input section (2) Input cylinder (3)
Input head (4) Feed screw (5) Motor
(6) Recording section (7) Recording cylinder (
8) Recording head (9) Feed screw (10) Motor (11) Rotating shaft (12) Motor (1)
3) First photoelectric conversion section (14) Second photoelectric conversion section (
15) Light source for transmission (16) Original image to be scanned (16
a) (16b) Original picture (1) Image signal processing circuit (18) Gate (19) Photosensitive material (19a) Register hole (19') Color separation film plate (20) Reflection light source (21) Mounting paper (21a) ) Transparent film base (21b) White peel layer (21c) Register hole (22) Comparator (24) Trimming window (25) Area (
26) Trimming area (27) Line drawing film (
28) Printing plate film (37) (38) Infrared cutoff filter (42) (43) Visible light cutoff filter (g) Color separation image signal (g2) Output signal (g, )
Output signal (e engineering) Output signal (e2) Binary signal Figure 6 Procedure amendment form (1 button March 2nd, 1985)

Claims (2)

[Claims] (1) When creating a color separation film by color-separating one or more original images that require trimming using a color scanner, a trimming window is provided to divide the trimming area of the original image, and a sheet member with high surface reflectance is used. By attaching the original image corresponding to the trimming area, attaching the sheet member with the original image attached to the input cylinder, and scanning it,
The color-separated image of the original image within the trimming window, which is detected by the first photoelectric conversion means that separates the original image using white light in the visible range as a light source, is recorded on the photosensitive material on the recording cylinder, and the first photoelectric conversion means By projecting a light beam that can be separated from the white light onto the scanning point of the means, an image of the surface of the remaining portion of the sheet member outside the trimming window detected by the second photoelectric conversion means is obtained during exposure. A method for producing a color separation film, characterized in that it is recorded on the photosensitive material as an image that causes a masking effect. (2) comprising a light source light for color separation and a light source light for binary separation, a means for discriminating the two types of light source light, and a photoelectric conversion unit for the light source light discriminated into two types, and a binary When the output of the second photoelectric conversion section for color separation is small, the output from the first photoelectric conversion section for color separation is changed, and when the output of the second photoelectric conversion section is large, the output of the second photoelectric conversion section is A color separation film producing device comprising a recording head that records output according to the output.