JPH0410873B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to the improvement of a printed matter whose pattern appears three-dimensional when viewed with two different color filters placed on both eyes. This invention relates to printed matter that can be expressed using ordinary process colors of cyan, magenta, yellow, and black without using specially adjusted special colors (so-called "spot colors").

Conventional technology Conventionally, two almost identical patterns obtained by changing the shooting position, etc. are
A filter 3 of the same hue as the first pattern (for example, blue) is printed on the right side, and a filter 3 of the same hue as the second pattern is printed on the left side. There is known a printed matter that is made so that the pattern appears to be floating or sinking at the position shown in 5 when viewed using a glasses-like device equipped with a filter 4 (for example, a red color).

However, in this type of printed matter, the hue of the film-like material used for the filter is practically fixed to red and blue, and two types of patterns (for example, the first
It is normal to print 1 and 2) in the figure, but
The hue of the ink does not match magenta and cyan in so-called process colors (cyan, magenta, yellow and black). For this reason, it is inconvenient to use specially adjusted "spot colors" in addition to process colors.

Furthermore, this kind of three-dimensional printed matter requires a separate eyeglass-like device, so for people who do not have a glasses-like device, it is easy to see that the two patterns, red and blue, are simply misaligned. In this case, the appearance is undesirable, so recently, regular printing, especially color printing, has been used in combination, and printing that looks three-dimensional when used with glasses-like equipment is sometimes applied. Rubbing is being done. However, when using regular printing together with printing that looks three-dimensional when using a glasses-like device, two types of "spot colors" and normal process colors (cyan, magenta, yellow, and black) are required. Therefore, compared to normal printing, printing for two colors is required, which is time-consuming and disadvantageous, such as requiring a large-sized printing machine with a large number of printing units.

Problems to be Solved by the Invention Therefore, the present invention solves the drawbacks of the prior art and uses only regular process colors without using any "spot colors" and by using a spectacle-like device as before. The purpose is to provide printed materials that appear three-dimensional when viewed.

Means for Solving the Problems In the present invention, instead of printing areas that are desired to appear three-dimensionally using a single special color ink such as red or blue, overprinting of process colors is used. By expressing the hue of the "spot color", the present invention provides a printed matter that appears three-dimensional when viewed using a glasses-like instrument, as in the past.

FIG. 2 is a plan view of an embodiment of the present invention, in which a first pattern 11 and a second pattern 12 are printed and formed in a staggered manner at the bottom of a printing substrate 10, and a normal pattern is formed at the top. This shows the state in which the image is printed and formed.

The printing substrate 10 usually includes an object to be printed, such as paper, plastic film, metal foil, etc., but it may not be a composite of these materials or a thick, plate-shaped material. Good too.

The first pattern 11 is printed, for example, in a blue hue, and the second pattern 12 is printed, for example, in a red hue.

An example of a red hue is a halftone area ratio of 5~
It is obtained by overprinting a magenta plate with a dot area ratio of about 80% and a yellow plate with a dot area ratio of about 5 to 60%, and an example of a blue hue is a dot area ratio of 5.
It is obtained by overprinting a cyan plate with a dot area ratio of about 70% and a yellow plate with a halftone dot area ratio of about 5 to 40%. Of course, in the overlapping area between the red pattern and the blue pattern, in this example, the halftone area ratio of the yellow plate is increased in advance, and two yellow plates are not produced, but only one plate is needed.

In the above example, if we use the same red filter and blue filter as in the past, and look at the printed matter through a glasses-like device with a blue filter on the right side and a red filter on the left side, we will see the image shown in Figure 1. Similarly, the pattern appears to float or sink.

As a blue filter, one that absorbs light with a wavelength of about 500 nm or more and transmits light with a wavelength of 500 nm or less is used, and as a red filter,
A filter that absorbs light with a wavelength of approximately 600 nm or less and transmits light with a wavelength of 600 nm or more is used, but the wavelength that is the boundary between absorption and transmission of these filters is determined by the first pattern and the second pattern. It can be determined as appropriate depending on the wavelength distribution of reflected light.

The pattern 13 is a normal pattern that is not intended to appear three-dimensional, and can be formed by printing using general process colors as appropriate.

Although the printed matter of the present invention can be produced by various printing methods, the key point in producing the printed matter lies in the photolithography process before the process of making a printing plate, that is, a printing plate.

To give an example, first, a first pattern 11 and a second pattern 12 are printed on a printing base to give a three-dimensional appearance. Conveniently, this printing is carried out using, for example, an offset proofing press. At this time,
The inks used to print the first image and the second image may be conventional "spot color" inks. Further, if necessary, normal pictures may be printed side by side. The printed material is then used as a manuscript, and a scanner or camera is used to separate it into four colors.
For example, in the example described above, the color of the red "special color" ink is separated into magenta and yellow plates so that the portion printed with the "special color" ink can be expressed in normal process colors. It should be noted that a normal picture may be color separated separately from this, or may be color separated at the same time.

Alternatively, as described above, it is possible to use a scanner from the beginning without printing with "spot color" ink and creating an original for the scanner or camera. At this time, the first pattern 11 and the second pattern 12 are selected in advance.
To create hues using process colors, determine the dot area ratio of each process color based on the highest density part of the original image, and use the original image or the positive or negative of the original image as an original to create the maximum dot area ratio determined above. It is preferable to set the dot area ratio to the maximum, output the photographic film according to the density of the original image, expose the photographic film, and develop it.

Effects/Effects Regardless of whether the printed matter of the present invention is produced by any of the above methods, each of the first pattern and second pattern for expressing a three-dimensional effect is formed by printing with "spot color" ink alone. Since the same hue was created by overprinting ordinary process color inks, filters of two predetermined colors were placed in the left and right eyes using a spectacle-like device, etc., as in the past. Not only can you obtain the same three-dimensional effect by viewing the image, but you can print using only process colors, which means fewer types of ink are used, which reduces the number of overprints.
There is little printing loss, ink management is easy, and you can use a general-purpose 4-color printer that prints only with normal process colors, so you can use a special 6-color printer instead. It has the advantage that printing is extremely easy and there is no need to use anything.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing a conventional printed matter, and FIG. 2 is a plan view showing an embodiment of the present invention. 1... Red pattern, 2... Blue pattern, 3...
Blue filter, 4...Red filter, 5
...Three-dimensional pattern, 10...Printing material, 11...1st
pattern, 12... second pattern, 13... normal pattern.

Claims (1)

[Scope of Claims] 1. A first pattern consisting of a first color obtained by overprinting two or more colors selected from cyan, magenta, yellow, and black, and two or more colors selected from each of the above colors. A printed matter comprising a second pattern obtained by overprinting, a second color different from the first color, and a second pattern provided offset from the first pattern. 2. The printed matter according to claim 1, wherein each color is cyan, magenta, and yellow. 3. The printed matter according to claim 1 or 2, which has a normal picture in addition to the two pictures, the first picture and the second picture. 4. The printed matter according to claim 3, wherein the normal picture pattern is provided by appropriately overprinting cyan, magenta, yellow, and black.