JPS5836895B2 - Tashiyokuzuri Yogenban - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an original plate for multicolor printing suitable for imparting a unique expression without impairing the colors and gradations of an original.

Conventional 0) In photolithographic printed matter, the shape and arrangement of halftone dots is limited to geometrical arrangements such as circles and diamonds by commercially available screens, so it is impossible to arbitrarily shape and arrange halftone dots. It is.

In addition, in the case of a contact screen, the gradation of an original is expressed by the size of its shape, but in the case of a glass screen, the shape is a limited number of fixed shapes, and in the case of a glass screen, it is expressed by the lattice state and angle of the screen. Although halftone dots of any size and size can be obtained by combining aperture changes, it is difficult to obtain the same dot shape as the aperture, and it is especially difficult to obtain the same shape in the entire gradation range, resulting in distorted patterns. become.

It is difficult to impart zero-distinction expression to a document due to the raised state of the halftone dot shape.

In the present invention, it is possible to easily pattern any halftone dot shape, and to perform halftone photographing based on the pattern, so it is possible to clearly maintain halftone dots having the same shape θ in the entire gradation range.

Therefore, it is an object to provide an original plate that is effective in imparting unique expressions such as giving a fantastic feeling without impairing the colors and gradations of the manuscript.

That is, the original plate according to the present invention can be formed by patterning a pattern of arbitrary shape by optical means, by patterning a halftone dot (single) one by one with a multi-faceted machine (usually called a multi-faceted machine), or by patterning several kinds of halftone dots. (single substance) is patterned using optical means in an appropriate manner, and this multi-faceted pattern is fixed at a fixed position when forming a mesh plate, and each color separation plate is photographed to make the same shape O) clear halftone dots. When printing, each color halftone plate Q) is printed on top of the other so that the zero center of each halftone dot coincides, so that the halftone dot shape stands out clearly, and the colors and colors of the original are printed. This is a struggle to provide a unique expression such as a fantastical feeling without impairing the gradation. The original plate according to the present invention will be described below with reference to the drawings.

Figure 1 shows the case where each color separation plate of a manuscript is photographed using an optical system to create a halftone plate.A diaphragm 2, usually a round or rectangular one, is placed between the first pair of lenses 1 and 1. , the color separation plates 3 of the original are arranged in front, a photosensitive material 4 is mounted at the imaging position, and a screen 5 obtained by patterning an arbitrary pattern in an aligned state, the details of which will be described later, is arranged in front of the photosensitive material 4. The photograph is taken at a position that satisfies the relational expression:

In this case, the screen 5 is fixed at the same angle in consideration of overprinting during each color separation plate.

After photographing, halftone plates (original plates) for each color are made according to the conventional 0 method.

During printing, each halftone plate is coated with its own ink and printed one on top of the other.

In this printing, as shown in FIG. 2, the color separation plates, for example, the magenta plate, Φ halftone dot A, and the cyan plate, halftone dot B, are overlapped so that their centers coincide with each other.

When photographing using the screen 5 in this way, by keeping the screen 5 at the same angle and overlapping the plates so that the centers of halftone dot A and halftone dot B coincide, the halftone dots of the printed matter are The shape is the same in the entire gradation range, and as a result, the θ halftone dot pattern on the printed matter stands out clearly.

The same shape in X means that the halftone dot patterns A and B are the same or have similar shapes.

The creation of the screen 5, that is, the creation of the multifaceted pattern, is carried out, for example, by optical means as shown in Q) below.

The optical system in this case is approximately the same as the configuration shown in FIG.
Aperture 0 position, that is, between lenses 10 and 100)
As shown in FIG. 4, there is a diaphragm 11 having a convex transparent part or punched part 11a, and a large number of transparent pinholes 13a in front of the photosensitive material 12 as shown in FIG. 4b, and Q other parts. Each opaque pattern forming screen 13 is arranged, and a reflective plate is placed at the position of each color separation plate, or a direct light source is placed to expose the photosensitive material 12 to the pinhole 13a of the screen 13 as shown in FIG. 4C. The convex pattern 12a in the aligned state is exposed to light.

After this photographing, a series of Q) processes such as development are performed to obtain a multifaceted pattern.

Since a multi-sided pattern is obtained as described above,
A diaphragm 1 having transparent parts or punched parts 11a having a constant shape for the entire gradation area of the original in each color separation plate.
1 and a multifaceted halftone dot pattern obtained by developing a photosensitive material 12 that has been exposed and photographed by arranging a pattern-shaped screen 13 having transparent pinholes 13a at fixed positions for all gradation areas. It is possible to maintain clear halftone dots of the same shape in the entire gradation range of the original in each color separation plate.

That is, by using an aperture 11 having a transparent part or punched part 11a of a fixed shape and a pattern forming screen 13 having pinholes 13a arranged in a fixed arrangement, Q halftone dots of the same shape can be formed in the entire gradation area of the original. It can be kept clear.

Multi-sided patterns can be arbitrarily and easily created by not only arranging a single pattern but also arranging two types of patterns alternately.

It is also possible to take a photograph of a pattern on cloth or a painting and create a pattern with so-called strong contrast, which makes it clear to distinguish between transparent and opaque parts.

Furthermore, not only optical means but also patterns can be formed by arranging halftone dots (single dots) using a multi-faceted machine (multi-dot).

Next, the screen 5 is
That is, an example in which a multifaceted pattern is created and an example in which a halftone plate is created using an optical system as shown in FIG. 1 will be described.

1) Creation of multifaceted pattern Lens f = 400mm Bellows distance = 800~1000 Fighting screen distance = 10~25ynm Number of lines of screen 0 pinhole = 4 5 11/i
nch photosensitive material = Lith film 1l) Preparation of a mesh plate (halftone shooting) j) A multifaceted pattern prepared under CV conditions was used as the screen 5, and the aperture 2 was set to a normal one (the number of pinholes 04 in the screen 5 was 4513/ as above 0
inch).

Lens f = 4001I1vIt Distance between original and lens = 600mm Bellows distance = 1200mm Screen distance = 10~251lπ Flash-sensitive photosensitive material - lithium film The original plate according to the present invention has a clear halftone dot shape in the colored part of the printed matter. With θ that brings out arbitrary patterns such as θ, you can easily obtain printed matter with unique expressions such as fantasy even from realistic manuscripts, and have excellent expressiveness in posters, creative printed materials, etc. can demonstrate.

[Brief explanation of the drawing]

Figures 1 to 4 a, b, and c are used to explain the rules for making an original plate according to the present invention. FIG. 3 is a plan view showing the overlapping state, FIG. 3 is a schematic layout of an optical system for controlling a multifaceted pattern, and FIG. 4 is a plan view showing members of the optical system in FIG. 3. 1...Lens, 2...Aperture, 3...Each color separation plate, 4...Photosensitive material, 5...Screen.

Claims (1)

[Claims] 1. In a set of multi-color printing plates that express the colors and gradations of the manuscript by intended halftone dot patterns of figures or characters, the halftone dot patterns of all the original plates are at the same angle, and when overprinting, each color plate is The center of each halftone dot is placed at the same position, and the halftone dot pattern of the printed matter in which the original plates of each color are printed one on top of the other has the same shape in the entire gradation area. Original plate for multicolor printing.