JPH08310102A - Formation of color image - Google Patents

Abstract

PURPOSE: To provide a method for forming a simple color image which provides a color image by one operation. CONSTITUTION: The three primary color inks of cyan C, magenta M, and yellow Y are printed on the surface of a color image forming sheet 1 alternately in a strip form of a prescribed width, leaving no space. The image forming sheet 1 looks generally gray due to the mixture of the colors. A covering sheet 82 is made by printing a black ink to a transparent sheet. An image ABC is composed of black stripes 81. The black stripes 81 have a different width and interval for each of the image ABC. The covering sheet 82 is superposed on the color image forming sheet 1. The mixture of the primary colors which are not covered by the black stripes 81 provide a color image where images A, B and C of a different color are arranged in the background color of the color image forming sheet 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image forming method capable of obtaining a desired color image by a simple means.

[0002]

2. Description of the Related Art In the field of printing, for example, in order to obtain images of various color tones, a method of overprinting with a plurality of types of ink having different colors is used. For example, in color printing, a method of obtaining at least a desired color image by separating at least three primary colors and sequentially performing overprinting has been common.

[0003]

The conventional method is complicated because it requires a plurality of plate making or printing operations to obtain one color image. Compared to the case of forming a monochrome image, the manual printing requires three times as much labor, and the use of the printing apparatus requires the apparatus of three times the scale.

An object of the present invention is to provide a simple color image forming method capable of obtaining a color image by one operation similar to monochrome printing.

[0005]

According to a first aspect of the present invention, there is provided a method of forming a color image, wherein a covering means is superposed on a color area composed of a plurality of kinds of colors arranged regularly, and the covering means in the color area is arranged. It is characterized in that a desired color is exhibited by mixing colors that do not overlap with each other.

A method of forming a color image according to a second aspect is the method of forming a color image according to the first aspect, characterized in that the covering means is black.

According to a third aspect of the present invention, there is provided a method of forming a color image according to the first aspect, wherein at least a part of the plurality of types of colors is a color other than the primary colors. .

A method of forming a color image according to a fourth aspect is the method of forming a color image according to the second aspect, characterized in that the covering means is printed on the color region.

According to a fifth aspect of the present invention, there is provided a method of forming a color image according to the second aspect, wherein the covering means is formed on a light transmissive sheet, and the light transmissive sheet is formed on the color region. It is characterized by stacking on top.

According to a sixth aspect of the present invention, there is provided a method of forming a color image according to the second aspect, wherein the light-transmissive color region is formed on a light-transmissive sheet, and the covering means is exposed to light. It is characterized in that it is formed on an opaque sheet, and the light transmissive sheet and the light opaque sheet are stacked.

A method of forming a color image according to a seventh aspect is the method of forming a color image according to the second aspect, wherein a color-changing layer is provided on the color region, and the color-changing layer is changed in color to cover the coating means. Is formed.

The method of forming a color image according to claim 8 is the method of forming a color image according to claim 4, wherein the color regions are stripes of a plurality of types of colors arranged regularly, The means is a black stripe whose phase substantially matches that of the color region.

A method for forming a color image according to a ninth aspect is the method for forming a color image according to the eighth aspect, wherein each width of the stripes of the plurality of types of colors is equal to or less than a predetermined dimension exceeding the resolution of the naked eye. It is characterized by being set to a value.

A color image forming method according to a tenth aspect is the color image forming method according to the eighth aspect, wherein the light reflection color is substantially in phase with stripes of a plurality of types of colors in the color region. A light-transmissive film having stripes of is superposed on the image of the original, and using this, an image composed of black stripes whose phases are substantially matched with stripes of a plurality of types of colors in the color region is formed. It is characterized in that the covering means is formed using an image composed of stripes.

[0015]

The covering means is superposed on the color area composed of a plurality of types of colors arranged regularly. A desired color appears due to a color mixture of colors that do not overlap with the covering means in the color region.

[0016]

Embodiments In this embodiment, a color image object having an arbitrary color obtained by a simple operation, a method for forming the color image object, a forming apparatus for the color image object, and the color image object are configured. The present invention relates to a color image material forming sheet, a covering sheet, and the like. Figure 1
1 shows a color image forming sheet 1 used in an embodiment of the present invention. The color image forming sheet 1 is a sheet in which a color region composed of a plurality of types of regularly arranged colors is provided on a sheet-like substrate or the like. The color regions of the color image forming sheet 1 of this embodiment are cyan (indigo) C and magenta (red) M.
An ink of the three primary colors of yellow (yellow) Y is printed in a predetermined type on a sheet-shaped substrate such as paper.

In this embodiment, as shown in the enlarged view of FIG. 1, inks of respective colors are alternately printed in a predetermined order without a gap so as to form a stripe (band or stripe) having a width of a predetermined dimension. are doing. Therefore, this color image forming sheet 1
Are observed in different colors as a whole due to the mixture of the colors. The overall color differs depending on the reflection density of each color ink to be printed, the quality of the printing paper that is the printing medium, and the like. For example, when printed on high-quality paper, the reflection density is 1.22
At a reflection density of 0.95 results in a relatively light brown color, at a reflection density of 0.54 a light yellow or cream color, and at a reflection density of 0.38 a light reddish white. By changing the balance of the reflection densities of the inks of each color to be printed, the quality of the printing paper, which is the material to be printed, and the like, it is possible to make it appear black or gray.

In this embodiment, the print width of each band of each color can be freely set within the range of 0.05 mm to 0.22 mm in consideration of visual effects. Therefore, the stripe of each color is 0.1
Repeated at a pitch of 5 to 0.66 mm. If the stripe width is, for example, about 0.1 mm or less, it exceeds the resolution of the naked eye, so that it is not possible to visually recognize that the color area on the color image forming sheet 1 is composed of three color stripes.
Colors are naturally recognized by mixing colors. If the stripe width is 0.22 mm or more, it becomes difficult to mix colors. This assumes a color image object viewed at a close distance such as a card, but in the case of a color image object viewed from a relatively distant place such as a poster, each color image forming the color area of the color image forming sheet Even if the stripe width is wider, you will feel a color mixture.

The reflection density is an amount representing the degree to which a substance absorbs light during reflection. That is, assuming that the intensity of incident light is I _o and the intensity of reflected light is I, the reflection density D is log
It becomes ₁₀ (I _O / I). The reflection densitometer measuring the reflection density is a reflection densitometer RD- manufactured by Sakata Inx Co., Ltd.
920 (S), and the measurement range is concentration 0-2.5.
0, the colorimetric density is 0 to 2.50.

When a coating means is overlaid on a part of the color image forming sheet 1 to print, a part of the ink which is left uncovered is mixed and a constant color appears. In this embodiment,
White ink W was used as the coating means. For example, as shown in FIG. 2, if only the yellow Y portion of the color image forming sheet 1 is covered with the white ink W in a band shape, the color image forming sheet 1 is formed by the remaining color mixture of cyan S and magenta M. It looks blue (or purple) as a whole.

Alternatively, as shown in FIG. 3, if the white ink W is printed in a band shape on a part of the yellow Y and the entire cyan S of the color image forming sheet 1, the part of the remaining yellow Y is printed. The color image forming sheet 1 looks red as a whole due to the color mixture of magenta and M.

2 and 3, the white ink W is applied to the color image forming sheet 1 corresponding to the striped pattern of the color image forming sheet 1.
This is an example in which an arbitrary color can be obtained by printing in a strip shape on the top. Therefore, it is possible to obtain colors other than these examples, and the color image forming sheet 1 has an arbitrary color depending on the position and width of the white ink W to be printed on the color image forming sheet 1. Further, the print pattern of the white ink W can be changed so that the color that appears in each region in the color image forming sheet 1 is different. For example,
A full-color image can be displayed in the color image forming sheet 1.

FIG. 4 shows an example in which a single color image forming sheet 1 is covered with white to show a color image composed of plural kinds of colors. In this case, white coating means such as white ink
The color image forming sheet 1 may be directly provided in a predetermined pattern by any means such as printing or transfer, but in this example, the cover sheet 2 is a transparent sheet provided with a white cover means.
Then, a desired image pattern including a white band-shaped portion and a transparent portion is formed on the color image forming sheet 1.

The covering sheet 2 shown in FIG. 4 is a transparent sheet covered with white covering means. A portion on which a desired image (in the example shown in the figure, characters ABC) is formed of a white band portion 3 and a transparent portion 4, and the other portion is a white solid portion 5.

As shown in the enlarged view of FIG. 4, in the present embodiment, the white band portion 3 for forming the images A, B and C is used.
The transparent portion 4 and the transparent portion 4 have different widths and intervals.

When the covering sheet 2 is superposed on the color image forming sheet 1 shown in FIG. 1, a color image object 6 in which images A, B and C having different colors are arranged in a white background is obtained. In this embodiment, the colors of the images A, B, and C are not specified, but of course, an arbitrary color can be expressed by the width and the interval of the white band 3.

In the example of FIG. 4, the entire surface of the transparent sheet is previously covered with white covering means, and the covering means corresponding to the image portion is removed in stripes in a pattern so as to obtain a desired color. Alternatively, the white solid portion and the image may be directly formed on the transparent sheet by a white covering means.
Further, the white stripe-shaped covering means may be provided only on the portion of the transparent sheet corresponding to the image, and nothing may be provided on the other portions and the transparent portion may be left transparent. In that case, an image of an arbitrary color appears in the background color of the color image forming sheet 1 (a color that appears by mixing three colors of CMY).

Next, by covering a part of the color image forming sheet 1 with a covering means having a predetermined pattern, a color image forming apparatus is formed so that an image of a desired color is made to appear by the mixture of primary colors which are not covered up. Will be described. As a means for forming such a covering means, a method of first printing a white ink on a color image forming sheet as in the example described with reference to FIGS. 2 and 3 can be adopted.

More specifically, a stencil-type rotary printing device 10 as shown in FIG. 5 (a) can be used. The stencil drum 11 having an ink permeable peripheral wall is rotationally driven about its own axis by a driving unit (not shown). Inside the stencil drum 11, a doctor roller 12 and a squeegee roller 13 which form a part of the ink supply means are provided, and the inner peripheral surface of the stencil drum 11 is synchronized with the white color as a covering means in synchronization with the driving of the stencil drum 11. It is designed to be able to squeegee ink.

On the outer peripheral surface of the stencil drum 11, a stencil sheet that has been prepressed is wrapped. On this stencil sheet, a sliver pattern of white ink to be printed on the color image forming sheet 1 is prepared. Of course, the band-shaped pattern formed on the stencil sheet corresponds to the stripe pattern of the three primary colors formed on the color image forming sheet 1, so that a desired color appears on the color image forming sheet 1 after printing. Is configured. The stencil sheet is wound around the stencil sheet such that the longitudinal direction of the striped pattern formed on the stencil sheet and the moving direction of the peripheral surface of the stencil drum 11 coincide with each other.

Below the stencil drum 11, a press roller 14 as a pressing member is provided in contact with or close to the stencil drum 11. A color image forming sheet 1 as a printing paper sheet which becomes a color image material after printing is supplied between a stencil drum 11 and a press roller 14 which are rotationally driven in synchronization with each other. As shown in FIG. 5B, the color image forming sheet 1 is supplied so that the longitudinal direction of the striped pattern thereof coincides with the feeding direction of the stencil drum and the press roller.

When the rotary printing apparatus 10 having the above-mentioned structure is operated, the color image forming sheet 1 supplied between the stencil drum 11 and the press roller 14 is provided with a predetermined amount of white ink from the stencil base paper of the stencil drum 11. An image with a desired color is formed on the color image forming sheet 1 as a result of printing in a stripe pattern.

In the printing operation using the rotary printing apparatus 10, it is important to align the stencil sheet and the color image forming sheet 1 in the width direction orthogonal to the conveying direction of the color image forming sheet 1. If the relative positional relationship between the two shifts, the colors that appear will differ. Therefore, as shown in FIG. 5B, if the positions of the bands of the three primary colors are detected by the sensors at the two diagonal corners 1a and 1b of the conveyed color image forming sheet 1, the width of the color image forming sheet 1 is determined. The position regarding the direction can be precisely controlled, and the desired color can be faithfully realized.

As another method for printing the white ink on the color image forming sheet 1, a stencil type press printing apparatus 20 as shown in FIG. 6 can be used. On the lower surface of the frame body 21, a stencil sheet 22 that has been prepressed is provided. This stencil paper 22
In the plate, a striped pattern of white ink to be printed on the color image forming sheet 1 is formed. Of course, the striped pattern formed on the stencil sheet 22 corresponds to the striped pattern of the three primary colors formed on the color image forming sheet 1, and after printing, the color image forming sheet 1 has a desired color. It is formed so that the image appears.

White ink 23 is placed on the stencil sheet 22.
And a cover 24 is provided on the upper surface of the frame 21 to cover the white ink 23. When the press printing device 20 is positioned and placed on the color image forming sheet 1 and pressed by a predetermined pressure, the color image forming sheet 1 passes through the stencil sheet 22 and the white ink 23 has a predetermined stripe. A pattern is printed, and as a result, an image of a desired color is formed on the color image forming sheet 1. For the positioning of the color image forming sheet 1 and the stencil sheet 22 in the press printing apparatus 20 of this configuration, the same means as the positioning in the rotary printing apparatus 10 can be applied.

As a means for partially covering the pattern of the color image forming sheet to reveal a desired color, a method of providing the covering means on the color image forming sheet by a method other than stencil printing can be adopted.

FIG. 7 shows an apparatus in which a white transfer ribbon 30 and a thermal head 31 are used to form a white stripe of a predetermined pattern on a roll-shaped color image forming sheet 32 to obtain a color image object 33 of a desired color. is there. The roll-shaped transfer ribbon 30 and the roll-shaped transparent film 34 are superposed on each other, and are sandwiched between a thermal head 31 as a transfer means and a platen roller 35 and conveyed.

The thermal head 31 to which the drive signal is applied transfers the white ink 36 of the transfer ribbon to the transparent film 34, as shown in FIG. The pattern of the white ink 36 transferred to the transparent film 34 corresponds to the stripe pattern of the three primary colors formed on the color image forming sheet 32 described later, and the desired color is printed on the color image forming sheet 32 after printing. Is configured to appear.

As shown in FIG. 7, the transfer ribbon 3 after transfer
0a is wound up after coming out of the thermal head 31.
The transparent film 34 onto which the white ink 36 has been transferred is fed to the pressure feed roller 37. The pressure feeding roller 37
A roll-shaped color image forming sheet 32 is also fed into the sheet, and the transparent film 34 and the color image forming sheet 32 are integrated.

As shown in FIG. 8, in the color image forming sheet 32, a sheet portion 38 having stripe-shaped portions of three primary colors formed on the front side, and an adhesive layer 39 provided on the front side of the sheet portion 38. And the adhesive layer 4 on the rear surface side of the sheet portion 38.
And a release paper 41 that is provided through the sheet. The structure of the striped portions of the three primary colors is the same as the example described with reference to FIG.

As shown in FIG. 8, the transparent film 34 is formed on the adhesive layer 39 on the front side of the color image forming sheet 32.
The side on which the white ink 36 is transferred is pasted, and both are integrated. Observing from the transparent film 34 side,
The white ink 36 having a predetermined pattern is used as the color image forming sheet 3
Overlaps part of the pattern of the two primary colors. Therefore, the color image forming sheet 32 becomes a color image object 33 of a desired color / image by mixing the primary colors not covered with the white ink 36.

The color image material 33 discharged from the pressure feeding roller 37 can be cut to a desired length with a cutter 42, the release paper 41 can be peeled off, and the color image material 33 can be attached to an arbitrary object.

The striped pattern of the white ink 36 and the striped pattern of the primary colors in this apparatus are both parallel to the transport direction. It should be noted that the both may be aligned by adjusting the axial position of the roll-shaped color image forming sheet 32.

In addition to the above, as a color image forming apparatus, it is also possible to use one that prints white toner on a color image forming sheet using a laser beam printer. Further, a thermal transfer ribbon of white ink is provided in a printing device of a word processor having a thermal head, a pattern formed on the screen of the word processor is printed on the color image forming sheet with white ink, and an image of a desired color as described above is obtained. May be formed.

In the embodiment described above, the striped patterns of the primary colors on the color image forming sheets 1 and 32 and the striped pattern of the white coating means for coating the same are parallel to each other. The colors that appeared were constant. However, when the two stripe-shaped patterns are inclined and overlapped with each other, a rainbow-like color effect that a plurality of colors appear while continuously changing is obtained. this is,
It is considered that the moire effect occurs because the coating state of the primary color stripe pattern is not constant and continuously changes in the longitudinal direction of the strip. The same effect can be obtained when the widths of the striped patterns of the covering are made non-uniform even if the striped patterns are not inclined to each other.

In the embodiment described above, cyan (indigo) is used.
A case was shown in which a part of the pattern of the three primary colors of magenta (red) and yellow (yellow) was covered with a white covering means to reveal a desired color. This is an example of a subtractive color mixture in which a printed matter or the like is observed with reflected light.

The present invention can also be applied to the case of additive color mixing by color mixing of transmitted light. In the case of additive color mixture, blue, red, and green are used as the three primary colors, and a light-impermeable coating material such as black ink can be used as the coating means. In the case of forming a color image product of additive color mixture, the light-transmissive inks of the three primary colors are alternately printed on a transparent sheet in a striped pattern without a gap, and this is used as a color image forming sheet. When this color image forming sheet is observed with transmitted light, it is colored as a whole and looks white.

A striped pattern is printed with black ink on the color image forming sheet. Alternatively, a light-reflective sheet such as white is printed with a black ink to form a stripe pattern in which the phases of the stripes of the color image forming sheet substantially match, and this is overlapped with the color image forming sheet. May be. In any case, light does not pass through the portion overlapping the black ink pattern, and thus the color of the color image forming sheet is determined by the color mixture of transmitted light in the portion not covered with the black ink. As described above, even in the case of additive color mixture, a desired image can be formed in a desired color on the color image forming sheet.

The light-impermeable coating means in the case of additive color mixture is not limited to black ink, and any ink that does not transmit light can be used. Further, not only the ink, but also a portion which is desired to be light-impermeable may be scratched so that light cannot pass easily.

In each of the embodiments described above, the three primary colors are used for the color image forming sheet, but in the present invention, it is not always necessary to use the three primary colors as the colors forming the color regions. For example, by using two of the three primary colors, three or more colors can be expressed. Further, the color region formed on the color image forming sheet does not necessarily have to be formed by primary colors, and any other color can be adopted. For example, various intermediate colors other than the primary colors, metallic luster colors including gold and silver colors, pearl luster colors, fluorescent colors, colors with inks including metal powder, and the like can be arbitrarily adopted in consideration of visual effects. For example, if fluorescent colors are used, the entire image looks bright and bright.

In the embodiments described above, the covering means provided by printing on the color image forming sheet or the covering means provided on the covering sheet is white or black, but the covering means of the present invention is not necessarily white or black. No need. The above-mentioned various colors used in the color area of the color image forming sheet are also adopted as the color of the covering means in consideration of the visual effect of the combination with the color used for the color image forming sheet. be able to. When the black covering means is overlaid on the color image forming sheet, the color of the predetermined pattern forming the color image forming sheet is microscopically surrounded by the black pattern. The outline of the image appearing on the forming sheet becomes clearer.

In each of the embodiments described above, the covering means is provided on the color image forming sheet having a color area to obtain a desired color, but the color area need not necessarily be provided on the sheet. For example, the same color region as the color image forming sheet is formed on the surface of an article having a three-dimensional outer shape, and a covering means is provided for the same to provide a desired color on the surface of the article. You can also

In the embodiment described above, a striped pattern (striped pattern) is adopted as a color pattern forming a color region on the color image forming sheet, and a striped pattern covering means is superposed on the striped pattern to form an image of a desired color. Had formed. In this case, the positioning of the color pattern and the covering means does not require high accuracy at least in the longitudinal direction of the stripe, and the desired color can be accurately realized by aligning in the direction orthogonal to the stripe.

However, in the present invention, the color pattern for forming the color area is not limited to the stripe. For example, it may be a pattern in which minute dots of plural kinds of colors are regularly arranged. The shape of the dots may be a minute round shape, a square shape, or the like. The arrangement of the dots may be any as long as a natural color mixture can be obtained when observed with the naked eye. In this case, the covering means to be overlaid on the color pattern may be constituted by a pattern composed of similar minute points whose phases substantially match the pattern of the color region.

Next, another embodiment of the color image forming apparatus is shown in FIG.
~ 12 will be described. The color image forming apparatus 50 includes cyan (indigo) and magenta (red) on a printing target paper 51 as a printing target.
A color image forming sheet is formed by printing color regions of a stripe pattern of three primary colors of yellow (yellow), and black ink as a covering means is continuously made in phase with this to form a color image forming sheet. By printing on the color image forming sheet, an image of a desired color can be displayed on the color image forming sheet.

The color image forming apparatus 50 has a printing paper 51.
A paper feed belt 52 is provided as a conveyance unit that conveys paper. A color region forming portion 53 is provided above the paper feed belt 51 at a position in the front half portion in the conveyance direction. The color area forming unit 53 has three band printing units 54, and each band printing unit 54 has cyan (indigo, C), magenta (red, M), respectively.
Stripe patterns of three primary colors of yellow (yellow, Y) are continuously printed on the printing paper 51 to form a color image forming sheet.

As shown in FIG. 10, each strip printing section 54 has a printing roller 55 and an ink pad 56 for supplying ink to the printing roller 55. Ink of each color is supplied to each ink pad 56 by an ink supply unit (not shown). The print roller 55 has a rotation shaft 55 a that is orthogonal to the conveyance direction of the print target paper 51. The print roller 55 is rotationally driven in synchronization with the drive of the paper feed belt 51, and prints on the print paper 51 while the print paper 51 is sandwiched between the paper feed belt 51 and the paper feed belt 51 and conveyed. On the peripheral surface of the printing roller 55, a large number of ridges 57 having a predetermined width parallel to the conveyance direction of the print target paper 51 are formed with a groove 58 having a predetermined width interposed therebetween. As shown in FIG. 11, in this embodiment, the width of the ridge 57 is 62.5 μm and the width of the groove 58 is 125 μm. The ridges 57 of the printing rollers 55 of the three strip printing units 54 are displaced by one pitch (62.5 μm) in the direction of the rotation shaft 55a of the printing rollers 55, and one sheet of printing paper 51 is printed.
The cyan (indigo), magenta (red), and yellow (yellow) stripes can be printed continuously without any gaps. Depending on the type of ink, the width of each ridge 57 may be set to 60 μm while leaving the pitch of each ridge 57 unchanged, and a gap may be provided between the stripes formed on the printing paper. This gap in which stripes are not printed serves as a bleeding preventive portion between adjacent stripes, and in this case, the effect of brightening the entire printing paper 51 is also obtained.

As shown in FIG. 9, above the paper feed belt 51, at the position of the latter half of the conveyance direction, the covering area forming portion 6 is formed.
0 is provided. The covering region forming unit 60 is a thermal head 61 that heat-sensitively punches the stencil sheet S to make a plate.
And a stencil printing unit 62 to which the stencil printing base paper S thus prepared is mounted and driven.

As shown in FIG. 12, the thermal head 61
Is a large number of heating elements 6 arranged at a predetermined pitch in the main scanning direction.
Three. Each heating element 63 is provided on the electrode 63a. The heating element 63 in this embodiment is 48 to 60 μm in the sub-scanning direction parallel to the longitudinal direction of the stripes of the three primary colors printed on the printing paper 51, and 45 μm in the main-scanning direction orthogonal to the sub-scanning direction. . The arrangement pitch of the heating elements 63 in this embodiment is substantially the same as the pitch of the stripes of the color image forming sheet formed in the color area forming section 53. That is, the heating elements are arranged at a pitch of 62.5 μm along the main scanning direction.

The stencil printing section 62 has a plate cylinder 64 which is driven to rotate about its own axis. At least a part of the peripheral surface of the plate cylinder 64 has an ink permeable printing area, and the stencil printing base paper S thus prepared is mounted on the peripheral surface of the plate cylinder 64 including the printing area. Inside the plate cylinder 64, the plate cylinder 64
Ink supply means 65 for supplying ink to the inner peripheral surface of the is provided. The plate cylinder 64 is rotationally driven in synchronization with the paper feed belt 51, and is placed between the plate cylinder 64 and the paper feed belt 51.
Printing is performed on the printing target paper 51 while being conveyed while sandwiching it. In this embodiment, black ink is used.

Although not shown, the color image forming apparatus 50 of this embodiment generates a thermal head drive signal by processing the reading means for reading the full-color original image to be printed and the image data read by the reading means. It has a thermal head drive unit. According to this thermal head drive unit, proper black printing is performed on each of the three primary color stripes formed on the printing paper 51, and the original full-color image can be reproduced by the color mixture of the portions not covered with black. Thus, the stencil sheet S can be punched.

As shown in FIG. 12, in the present embodiment, the perforated portion (master hole 66) of the stencil printing base paper S which has been plate-mounted and is formed in the stencil printing section 62 and the printing paper 51. The formed stripes of the respective colors of the color areas are configured to meet at positions corresponding to each other. Master hole 66 of stencil printing base paper S on plate cylinder 64
And the alignment with the stripes of each color of the printing target paper 51 sent from the color area forming unit 53 are shown in FIG.
The method may be substantially the same as that of the embodiment described with reference to FIG.

According to the color image forming apparatus 50 of this embodiment,
The stencil sheet S used is one sheet, and the plate cylinder 64 used
The number of stencil printing operations is one, and a full-color image (color image) can be formed.

Next, an embodiment in which a black color coating means is printed on a color image forming sheet prepared in advance to form a desired color image will be described. In this embodiment, a stencil-type press printing device 20 shown in FIG. 6 is used. The usage and the like are substantially the same as those in the above-described embodiment described with reference to FIG. 6, but black ink is used instead of white ink. The color image forming sheet used is the same as that shown in FIG.

A method for making the stencil printing base paper S used here will be described with reference to FIG. Stripes having substantially the same phase as the primary color stripes in the color region of the color image forming sheet are formed on the light transmissive film in a light reflection color. In this embodiment, a white stripe 71 is formed on a transparent sheet 70 as a light transmissive film. This is placed on the original 72 and electronically copied to form a second original 73 composed of black stripes. Second manuscript 73
The phase of the black stripes constituting the above is substantially in phase with the stripes of each primary color in the color area of the color image forming sheet. The stencil printing base paper S is superposed on the second original 73 composed of black stripes, and flash light is emitted from the side of the stencil printing base S to heat the black portion of the second original 73 to heat the stencil printing base S. Make a plate. It is also possible to form a stamp by using the stencil printing base paper S made by the method as in this embodiment and press the stamp on the color image forming sheet to form a color image. In this case, since the positional relationship of the black stripes of the stamp with respect to the stripes of the color area on the color image forming sheet changes each time it is pressed, the color of the obtained color image changes delicately each time, resulting in a variety of colors. You can enjoy the change.

A method for providing a desired color by providing a black covering means on a color image forming sheet prepared in advance can be performed in substantially the same manner as the method shown in FIGS. 7 and 8.
Further, the black toner may be attached to the color image forming sheet by using a laser beam printer. Further, a thermal transfer ribbon of black ink is provided in the printing device of the word processor having a thermal head, and the pattern formed on the screen of the word processor is printed on the color image forming sheet with the black ink to form an image of a desired color. Good. Alternatively, one side of the transparent sheet on which the black covering means is printed may be used as an adhesive side, and this may be attached as a seal to the color image forming sheet so that various colors may appear. In this case, the color slightly changes even if the position where the sticker is attached to the color image forming sheet is slightly displaced, so that various colors and the change can be enjoyed.

Next, on the color area side of the color image forming sheet, a color-changing layer or a color-developing layer as a covering means is provided so as to form a pattern substantially matching the entire surface or the pattern of the color area, and this is provided. An embodiment will be described in which a part of the color region is hidden by expressing a desired color by changing or developing a color.

The color-changing layer or color-developing layer may be a thermosensitive color-developing agent,
A photochromism agent, a thermochromism agent, a piezochromism agent, a liquid crystal, etc. can be used. The photochromic agent changes its color when exposed to ultraviolet rays and returns to its original color in the dark. Therefore, for example, if a photochromism agent that changes color to black is printed on a YMC stripe so as to cover a color other than a desired color, only the portion of the photochromism agent becomes black when it is irradiated with ultraviolet rays, and the photochromism agent is coated with the photochromism agent. Only the color of the non-existing part appears, and it is observed as if a color image emerges from the place where there is nothing. When the UV light disappears, it returns to its original state and the image disappears. The thermochromic agent causes heat and the piezochromic agent causes pressure to have the same effect as described above.
The liquid crystal can obtain a similar effect by heat or an electric field.

The thermosensitive color former as the color changing layer or the color developing layer will be described. The heat-sensitive color former contains one or both components of a leuco dye and a color developer.
The leuco dye which is the color former component and the acidic substance which is the color developer component are melted or mixed with each other by applying heat,
As a result, the leuco dye changes from colorless to colored.

As the leuco dye, those conventionally used for thermal paper can be used, and for example, fluorane type, triphenylmethane type, spiropyran type and the like are preferable. Specific examples of these include the following. 3-Cyclohexylamino-6-chlorofluorane 3-dimethylamino-5,7-dimethylfluorane 3-dimethylamino-7-chlorofluorane 3-dimethylamino-7-methylfluorane 3-dimethylamino-7,8 -Benzfluoran 3-dimethylamino-6-methyl-7-chlorofluorane 3-diethylamino-7- (o-chloroanilino) fluorane 3-dibutylamino-7- (o-chloroanilino) fluorane 3- (N-methyl-) N-amyl) amino-6-methyl-
7-anilinofluorane 3- (N-methyl-N-cyclohexyl) amino-6-
Methyl-7-anilinofluorane 3-diethylamino-6-methyl-7-anilinofluorane 3-morpholino-7- (N-propyl-trifluoromethylanilino) fluorane 3-pyrrolidino-7-trifluoromethylani Rinofluorane 3-pyrrolidino-7- (di-p-chlorophenyl) methylaminofluorane 3-diethylamino-5-chloro-7- (α-phenylethylamino) fluorane 3-diethylamino-5-methyl-7- ( α-phenylethylamino) fluorane 3-diethylamino-7-piperidinofluorane 3,3-bis (p-dimethylaminophenyl) -phthalide 3,3-bis (p-dibutylaminophenyl) -phthalide 3,3- Bis (p-dimethylaminophenyl) -6-dimethylaminophthalide 3,3-bi (P-Dimethylaminophenyl) -6-diethylaminophthalide 3,3-bis (p-dimethylaminophenyl) -6-chloroaminophthalide 6'-chloro-8'-methoxy-benzoindolino-pyrrillospirane 6'- Bromo-3′-methoxy-benzoindolino-pyrrilospirane etc.

As the color developer, various acidic substances which react with the leuco dye when heated to develop the leuco dye can be used. For example, a phenolic substance, an organic or inorganic acidic substance and the like are preferable. Are as follows. Salicylic acid, 3-isopropylsalicylic acid,
3-cyclohexylsalicylic acid, 4,4'-isopropylidene diphenol (bisphenol A), 4,4'-
Isopropylidene bis (2-chlorophenol), 4,
4'-isopropylidene bis (2,6-dibromophenol), 4,4'-isopropylidene bis (2-methylphenol), 4,4'-cyclohexylidene bisphenol, 4,4'-cyclohexylidene bis ( 2-methylphenol), 4-phenylphenol, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, 3,5-xylenol, thymol, 4-hydroxyacetophenone, catechol, resorcin, hydroquinone, pyrogallol, phloroglycin, 2 , 2'-methylenebis (4-chlorophenol), 2,2'-dihydroxydiphenyl, ethyl p-hydroxybenzoate, p-
Propyl hydroxybenzoate, butyl p-hydroxybenzoate, benzyl p-hydroxybenzoate, p-chlorobenzyl p-hydroxybenzoate, p-methylbenzyl p-hydroxybenzoate, benzoic acid, 1-hydroxy-2- Naphthoic acid, 2-hydroxy-6-naphthoic acid, 4-hydroxydiphenyl sulfone, bis (4-hydroxyphenyl) sulfide, 2-hydroxy-p-
Toluic acid, tartaric acid, oxalic acid, maleic acid, citric acid, succinic acid, boric acid, clay, activated clay and the like.

The use ratio of the leuco dye and the developer is 1 to 10 parts by weight of the developer with respect to 1 part by weight of the leuco dye.
It is preferably used in the range of 2 to 5 parts by weight.

A heat-melting component may be contained in order to enhance the coloring sensitivity. For example, compounds having a melting point of about 50 to 150 ° C., such as fatty acid ester, fatty acid amide, and wax, are preferable. Specific examples thereof include benzoic acid-4-benzyl ester, benzoic acid-4-methoxyphenyl ester, lauric acid amide, stearic acid amide, caproic acid amide, carnauba wax, montan wax, and polyethylene wax. The amount of these heat-melting components used is 1 to 10 parts by weight, preferably 1 to 3 parts by weight, based on 1 part by weight of the leuco dye.

The heat-sensitive agent described above is applied to the entire surface of the color image forming sheet in which a plurality of kinds of colors form a color region in a predetermined pattern (YMC stripes in the embodiment). When this color image forming sheet is printed by a thermal printer such as a word processor, the thermal head of the thermal printer develops (blackens) the heat sensitive agent and covers a part of the color area of the color image forming sheet. A color image appears on the color image forming sheet.

In this case, on the word processor side, there is software for selecting which color stripe of the color image forming sheet is to be coated according to the desired designated color, and the color image forming sheet and the thermal head. It is equipped with a positioning index or a positioning sensor for positioning.

Further, similar to the chromic agent, if the heat-sensitive agent is printed not on the entire surface of the color image forming sheet but in an image pattern, a color image appears on the color image forming sheet only by applying heat. Can be made.

If an image is printed on the color image forming sheet with a transparent adhesive, the powder is applied to the transparent adhesive of the image pattern by sprinkling color powder (black toner or the like) on the image. An image can be attached and made to stand out on the color image forming sheet.

Next, the color image forming sheet shown in FIG.
An embodiment will be described in which a cover sheet in which a black covering means is printed on a light-permeable sheet is used and the two are overlapped to form a desired color image. As shown in FIG. 14, a desired image (the letters “ABC” in the figure) is formed on the light-transmitting sheet 80 by black stripes 81. Each part of the image is composed of black stripes 81 having different thicknesses. The light-transmitting sheet 80 is overlaid on the color area side of the color image forming sheet 1 described with reference to FIG. The background color of the color image forming sheet 1 is observed from the transparent portion of the light-transmitting sheet 80, and in the image portion of the light-transmitting sheet 80, a mixture of primary colors not hidden by the black stripes 81 is caused. The image "ABC" is observed in three colors. A black stripe 81 is formed with a phase (width and pitch) substantially matching the stripe of the color image forming sheet 1, and the black stripe 81 forms the light-transmitting sheet 8.
The image may be formed on 0.

CMY stripes are formed on the light-transmitting sheet 80 with the light-transmitting ink, and black stripes are formed on the light-impermeable sheet. The same effect as in the case of FIG.

Next, the color image forming sheet 1 shown in FIG.
And a cover sheet 82 in which a black stripe 81 is printed on a light-transmitting sheet 80, the both sheets are overlapped to form a desired color image. , At least a part of the color image object so that both sheets can move relative to each other. For example, only the corresponding one side portions of both rectangular sheets are fixed to each other so that the covering sheet 82 can move with respect to the color image forming sheet 1. By doing this, both seats 1,82
Since the color of the color image changes due to a very small relative movement of, you can enjoy a variety of color tones and their changes,
The visual aesthetic effect is extremely large, and it is also effective as an advertising means.

According to the present invention, the covering means is superposed on at least a part of the color region composed of a plurality of kinds of colors arranged regularly, and the desired color is expressed by the color mixture of the colors not overlapping with the covering means. There is. As is clear from the above-described embodiments, various colors can be adopted as the colors forming the color regions, and the patterns formed by the colors are not limited to stripes and various patterns can be adopted. Furthermore, various colors can be adopted for the color of the covering means for covering the color region,
As the means for providing the covering means on the color region, various devices, instruments, materials, methods, etc. can be applied as exemplified in the embodiment.

[0082]

According to the present invention, the covering means is superposed on the color region composed of a plurality of kinds of colors arranged regularly, and the desired color can be expressed by the color mixture which does not overlap with the covering means. There is an effect that the convenience in color image printing is remarkably improved such that an image of a desired color can be formed by one operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a color image forming sheet of one embodiment and a partially enlarged view thereof.

FIG. 2 is a perspective view showing a color image forming sheet of one embodiment on which a covering means is printed, and a partially enlarged view thereof.

FIG. 3 is a perspective view showing a color image forming sheet of one embodiment on which a covering means is printed, and a partially enlarged view thereof.

FIG. 4 is a perspective view showing a color sheet obtained by stacking a cover sheet having white stripe coating means and a color image forming sheet, and a partially enlarged view of the cover sheet and the color image forming sheet. .

FIG. 5 is a diagram showing a schematic structure of a color image forming apparatus using rotary stencil printing and a mode of conveying a color image forming sheet in the apparatus.

FIG. 6 is a schematic structural diagram of a color image forming apparatus using press stencil printing.

FIG. 7 is a schematic structural diagram of a color image forming apparatus using a ribbon-shaped color image forming sheet, a white transfer ribbon, and a thermal head.

8 is an enlarged sectional view of a color image object and the like formed in the apparatus shown in FIG.

FIG. 9 is a perspective view of another embodiment of the color image forming apparatus.

10 is an enlarged perspective view of a strip printing unit of the color image forming apparatus shown in FIG.

11 is a cross-sectional view showing the structure of a printing roller in a strip printing unit of the color image forming apparatus shown in FIG.

12 is a diagram showing a relationship among a heating element, a master hole, and a print target paper in the color image forming apparatus shown in FIG.

FIG. 13 is a diagram illustrating a procedure of forming a covering unit including a black stripe by using an original image.

FIG. 14 is a perspective view showing a color image material obtained by stacking a covering sheet having a black stripe covering means and a color image forming sheet, and a partially enlarged view of the covering sheet and the color image forming sheet. .

[Explanation of symbols]

 1,32 color image forming sheet 6,33 color image object 10 rotary printing device as a color image forming device 20 press printing device as a color image forming device 23, 36, W white ink as a covering means 50 color image forming device 52 Paper Feed Belt as Conveying Device 53 Color Area Forming Part 54 Strip Printing Part 60 Covering Area Forming Part 61 Thermal Head 62 Stencil Printing Part 63 Heating Element 80 Light-Passing Sheet 81 Black Stripe as Covering Part 82 Covering Sheet

Claims (10)

[Claims] 1. A color characterized in that a covering means is superposed on a color area composed of a plurality of kinds of colors arranged regularly, and a desired color is expressed by a color mixture of colors not overlapping with the covering means in the color area. Image formation method. 2. The method for forming a color image according to claim 1, wherein the coating means is black. 3. The color image forming method according to claim 1, wherein at least a part of the plurality of types of colors is a color other than the primary colors. 4. The method of forming a color image according to claim 2, wherein the covering means is printed on the color region. 5. The method of forming a color image according to claim 2, wherein the covering means is formed on a light transmissive sheet, and the light transmissive sheet is overlaid on the color region. 6. The light-transmitting color region is formed on a light-transmitting sheet, and the covering means is formed on a light-impermeable sheet,
The method of forming a color image according to claim 2, wherein the light transmissive sheet and the light impermeable sheet are stacked. 7. The method for forming a color image according to claim 2, wherein a color-changing layer is provided on the color region, and the color-changing layer is changed in color to form the covering means. 8. The color according to claim 4, wherein the color area is a stripe of a plurality of types of colors that are regularly arranged, and the covering means is a black stripe whose phase substantially matches that of the color area. Image formation method. 9. The method for forming a color image according to claim 8, wherein each width of the stripes of the plurality of types of colors is set to a value equal to or smaller than a predetermined dimension that exceeds the resolution of the naked eye. 10. A light-transmissive film having stripes of light-reflecting colors whose phases are substantially matched with stripes of a plurality of colors in the color area is superimposed on an image of an original, and the light-transmitting film is used to form a plurality of stripes in the color area. 9. The color image according to claim 8, wherein an image composed of black stripes whose phases substantially match those of stripes of different colors is formed, and the covering means is formed using the image composed of the black stripes. Forming method.