Source: http://www.freepatentsonline.com/y2009/0244251.html
Timestamp: 2019-07-18 03:21:53
Document Index: 461324561

Matched Legal Cases: ['art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26', 'art 26']

THERMAL TRANSFER PRINTING METHOD - Dai Nippon Printing Co., Ltd.
United States Patent Application 20090244251
Onishi, Jiro (Tokyo-To, JP)
12/407200
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20080246802 Printhead Maintenance Station Incorporating A Dabbing Device October, 2008 Karppinen et al.
20070296794 Printing Unit Incorporating A Replaceable Media Supply Cartridge Located Between A Connector And A Print Head Assembly December, 2007 Silverbrook
1. A thermal transfer printing method comprising: a step in which a photographic paper is unwound from a photographic paper roll and the photographic paper is sent; a step in which, with the use of an ink ribbon having a yellow layer, a magenta layer, and a cyan layer, a screen having an image is formed on the photographic paper, by transferring a yellow colorant, a magenta colorant, and a cyan colorant onto the photographic paper by sublimation by means of a first heating means, without providing a margin between the screen and a screen adjacent thereto; a step in which, after the screen has been formed on the photographic paper, the photographic paper is cut by means of a cutting means at a rear edge of the screen so as to manufacture an individual photographic paper on which the screen has been formed, and the individual photographic paper is conveyed to a second heating means; and a step in which, with the use of a screen protective ribbon having a screen protective film, a screen protective layer is formed on an overall surface of the screen formed on the individual photographic paper, by thermally transferring the screen protective film onto the overall surface of the screen formed on the individual photographic paper by means of the second heating means.
2. The thermal transfer printing method according to claim 1, wherein when the screen is formed on the photographic paper by the first heating means, the image of the screen formed on the photographic paper is gradually thinned from at least a part near to the rear edge of the screen toward at least the rear edge of the screen.
3. The thermal transfer printing method according to claim 2, wherein when the screen is formed on the photographic paper by the first heating means, an amount of each of the Y colorant, the magenta colorant, and the cyan colorant is gradually decreased from at least a part near to the rear edge of the screen toward at least the rear edge of the screen, so as to gradually thin the image of the screen formed on the photographic paper.
4. The thermal transfer printing method according to claim 2, wherein when the screen is formed on the photographic paper by the first heating means, an amount of energy for heating each of the yellow layer, the magenta layer, and the cyan layer, by the first heating means is gradually decreased from at least a part near to the rear edge of the screen toward at least the rear edge of the screen, so as to gradually thin the image of the screen formed on the photographic paper.
5. A thermal transfer printing method comprising: a step in which a photographic paper is unwound from a photographic paper roll and the photographic paper is sent; a step in which, with the use of an ink ribbon having a yellow layer, a magenta layer, and a cyan layer, a plurality of screens each having an image are continuously formed on the photographic paper, by transferring a yellow colorant, a magenta colorant, and a cyan colorant onto the photographic paper by sublimation by means of a first heating means; a step in which, after the plurality of screens have been continuously formed on the photographic paper, the photographic paper is cut by means of a cutting means so as to manufacture individual photographic papers, and the individual photographic papers are conveyed to a second heating means; and a step in which, with the use of a screen protective ribbon having screen protective films, screen protective layers are formed on surfaces of the screens formed on the individual photographic papers, by thermally transferring the screen protective films onto the surfaces of the screens formed on the individual photographic papers by means of the second heating means.
6. The thermal transfer printing method according to claim 5, wherein the cutting means cuts the photographic paper at each screen, so as to form the individual photographic papers.
Generally when screens are formed on a photographic paper by a thermal transfer printing system that forms screens each having an image on a photographic paper, a yellow colorant (Y), a magenta colorant (M), and a cyan colorant (C) are sequentially transferred onto a photographic paper by sublimation, so as to form a screen having an image. As shown in FIG. 9, the screen 56 is formed larger than an individual photographic paper 54, which will be manufactured thereafter by cutting the a photographic paper 52. The screen 56 is provided with a margin cut portion 53 between the screen 56 and a forward screen 56 adjacent thereto, and another margin cut portion 53 between the screen 56 and a rearward screen 56 adjacent thereto. Then, a screen protective layer 55 having the same dimensions as those of the screen 56 is formed on the screen 56, and the photographic paper 52 is cut at a position on which a predetermined margin is left from a front edge 56b of the screen 56 formed on the photographic paper 52. Then, the photographic paper 52 is cut at a position on which a predetermined margin is left from a rear edge 56a of the screen 56. Thus, the individual photographic paper 54 is manufactured (see, for example, Patent Document 1). Thereafter, the margin cut portions 53, which are located between the screen 56 and the forward screen 56 adjacent thereto, and between the screen 56 and rearward screen 56 adjacent thereto, are cut down.
In order to solve these problems, there has been known a method for forming screens without providing a margin between the adjacent screens. When screens are formed on a photographic paper by this method, as shown in FIG. 10, formed on a photographic paper 62 at first is a screen 66 having the same dimensions as those of an individual photographic paper 64 that will be obtained thereafter by cutting the photographic paper 62. Then, a screen protective layer 65 is formed on the screen 66 with a predetermined margin left from a rear edge 66a of the screen 66. After that, the photographic paper 62 is cut at the rear edge 66a of the screen 66, so that an individual photographic paper 64 is manufactured. In consideration of a case in which a cut position of the photographic paper 62 is shifted from the rear edge 66a of the screen 66, the screen protective layer 66 is formed with a predetermined margin left from the rear edge 66a of the screen 66.
However, as described above, when the screen protective layer is formed with a predetermined margin left from the rear edge of the screen, the screen protective layer is not formed on the screen at a position near to the rear end of the individual photographic paper, whereby a part of the screen near to the rear edge is exposed to the outside. Since the exposed part of the screen does not have a light resistance, there is a possibility that a color of the image might be bleached out over time. In addition, when someone touches the exposed part of the screen by hand, and the colorants of Y, M, and C forming the screen adhere to the hand, there is a possibility that the image on the screen might be deteriorated. In this case, it is difficult to maintain an image quality of the screen.
FIG. 4(a) is a view showing a state in which a screen having an image is formed on a photographic paper in the first embodiment of the thermal transfer printing method according to the present invention.
FIG. 4(b) is a view showing a state in which an individual photographic paper is manufactured in the first embodiment of the thermal transfer printing method according to the present invention.
FIG. 4(c) is a view showing a state in which a screen protective layer is formed on an overall surface of the screen formed on the individual photographic paper in the first embodiment of the thermal transfer printing method according to the present invention.
FIG. 6(a) is a view showing a state in which two screens each having an image are formed on a photographic paper in the second embodiment of the thermal transfer printing method according to the present invention.
FIG. 6(b) is a view showing a state in which two individual photographic papers are manufactured in the second embodiment of the thermal transfer printing method according to the present invention.
FIG. 6(c) is a view showing a state in which a screen protective layer is formed on an overall surface of the screen formed on each of the individual photographic papers in the second embodiment of the thermal transfer printing method according to the present invention.
FIG. 8(a) is a view showing a state in which two screens each having an image are formed on a photographic paper in the third embodiment of the thermal transfer printing method according to the present invention.
FIG. 8(b) is a view showing a state in which a multiple screen photographic paper composed of the two screens each having an image is manufactured in the third embodiment of the thermal transfer printing method according to the present invention.
FIG. 8(c) is a view showing a state in which a screen protective layer is formed on overall surfaces of the screens formed on the multiple screen photographic paper in the third embodiment of the thermal transfer printing method according to the present invention.
FIG. 8(d) is a view showing a state in which individual photographic papers are formed in the third embodiment of the thermal transfer printing method according to the present invention.
Disposed on the downstream side of the first thermal head 10 is a cutting means 19 configured to cut the photographic paper 2 on which a screen 6 has been formed by the first thermal head 10. The cutting means 19 cuts the photographic paper 2 on which the screen 6 has been formed at a rear edge 6a (see, FIG. 4(a)) of the screen 6, so as to manufacture an individual photographic paper 4 (see, FIG. 4(b)) on which the screen 6 has been formed. A distance between the first thermal head 10 and the cutting means 19 is preferably 50 mm or less, and more preferably 20 mm or less.
Between the cutting means 19 and the second thermal head 20, there is disposed a conveying means 26 configured to convey the individual photographic paper 4 formed by the cutting means 19 to the second thermal head 20. The conveying means 26 has a conveyor 26a on which the individual photographic paper 4 can be placed, and a driving part 26b configured to drive the conveyer 26a.
Connected to the second thermal head 20 is a second elevating means 23 configured to move the second thermal head 20 toward and apart from the conveyor 26a of the conveying means 26 in the up and down direction.
Then, as shown in FIG. 4(a), with the use of the ink ribbon 14, a screen 6 having an image is formed by sequentially transferring a yellow colorant, a magenta colorant, and a cyan colorant onto the photographic paper 2 by sublimation by means of the first thermal head 10, without providing a margin between the screen 6 and a screen adjacent thereto. In this case, the photographic paper 2 and the Y layer 15 (see, FIG. 2) of the ink ribbon 14 are arranged in position in the first place. Then, the first thermal head 10 is moved downward toward the platen roll 18 by the first elevating means 13 connected to the first thermal head 10, so that the first thermal head 10 is brought into contact with the platen roll 18 through the photographic paper 2 and the ink ribbon 14.
At this time, an amount of the Y colorant to be transferred onto the photographic paper 2 by sublimation is gradually decreased from a part near to the rear edge 6a of the screen 6 toward the rear edge 6a of the screen 6. Namely, the screen 6 is formed on the photographic paper 2 such that the image is gradually thinned from a part near to the rear edge 6a of the screen 6 toward the rear edge 6a of the screen 6. An area in which the colorant is gradually decreased is preferably in a range of 0.5 mm or less from the rear edge 6a over all the width of the photographic paper 2. In this case, a range in which the image is thinned from a part near to the rear edge 6a of the screen 6 is minimally restrained. In addition, even when a part of the image of the screen 6 overlaps with an image of a rearward screen 6 adjacent thereto, the part of the image of the screen 6 is prevented from appearing on the rearward screen 6.
Then, similarly to the method for transferring the Y colorant by sublimation, the M colorant and the C colorant are sequentially transferred onto the photographic paper 2 by sublimation, so that a screen 6 having an image is formed on the photographic paper 2 (see, FIG. 4(a)).
Then, as shown in FIG. 4(b), the photographic paper 2 is cut by the cutting means 19 at a rear end 6a of the screen 6, so that an individual photographic paper 4 on which the screen 6 has been formed is manufactured.
As described above, the distance between the first thermal head 10 and the cutting means 19 is 50 mm or less, preferably 20 mm or less. Namely, the cutting means 19 is positioned relatively nearer to the first thermal head 10. Thus, the photographic paper 2, which is precisely positioned with respect to the first thermal head 10, is sent to the cutting means 19 while the precise positioning is being maintained. Therefore, the photographic paper 2 can be precisely cut by the cutting means 19 at the rear edge 6a of the screen 6 on the photographic paper 2.
Then, as shown in FIG. 1, the individual photographic paper 4 is placed on the conveyor 26a of the conveying means 26. Thereafter, the conveyor 26a is driven by the driving part 26b of the conveying means 26, so that the individual photographic paper 4 is conveyed to a position below the second thermal head 20. During this operation, the screen protective ribbon 24 wound on the screen-protective-ribbon supply roll 21 is unwound therefrom, and the screen protective ribbon 24 is sent to the second thermal head 20.
Then, as shown in FIG. 4(c), with the use of the screen protective ribbon 24, a screen protective layer 5 is formed on an overall surface of the screen 6 formed on the individual photographic paper 4, by thermally transferring the screen protective film 25 onto the overall surface of the screen 6 formed on the individual photographic paper 4 by means of the second thermal head 20. In this case, the individual photographic paper 4 and the screen protective film 25 of the screen protective ribbon 24 are arranged in position in the first place. Then, as shown in FIG. 1, the second thermal head 20 is moved downward toward the conveyor 26a of the conveying means 26 by the second elevating means 23 connected to the second thermal head 20, so that the second thermal head 20 is brought into contact with the conveyor 26a of the conveying means 26 through the individual photographic paper 4 and the screen protective ribbon 24.
Then, the conveyor 26a is driven by the driving part 26b of the conveying means 26, so that the individual photographic paper 4 and the screen protective ribbon 24 on the conveyor 26a are sent forward. During this operation, the screen protective ribbon 24 is heated by the second thermal head 20, so that the screen protective film 25 is thermally transferred from the screen protective ribbon 24 onto an overall surface of the screen 6 formed on the individual photographic paper 4. At this time, the individual photographic paper 4 is sent forward by a distance corresponding to the screen 6 formed on the individual photographic paper 4, and the screen protective ribbon 24 is sent forward (to the side of the screen-protective-ribbon withdrawal roll 22) by a distance corresponding to the screen 6.
Then, the second thermal head 20 is moved upward by the second elevating means 23 so as to be away from the conveyor 26a of the conveying means 26. In this manner, the screen protective layer 5 is formed on the overall surface of the screen 6 formed on the individual photographic paper 4 (see, FIG. 4(c)).
According to this embodiment, with the use of the ink ribbon 14 having the yellow layer 15, the magenta layer 16, and the cyan layer 17, the screen 6 having an image is formed at first on the photographic paper 2, by transferring the Y colorant, the M colorant, and the C colorant onto the photographic paper 2 by sublimation by means of the first thermal head 10, without providing a margin between the screen 6 and a screen adjacent thereto. Then, the photographic paper 2 is cut by means of the cutting means 19 at the rear edge 6a of the screen 6 so as to manufacture the individual photographic paper 4 on which the screen 6 has been formed. The individual photographic paper 4 is then conveyed by the conveying means 26 toward the second thermal head 20. Thereafter, with the use of the screen protective ribbon 24 having the screen protective film 25, the screen protective layer 5 is formed on the overall surface of the screen 6 formed on the individual photographic paper 4, by thermally transferring the screen protective film 25 onto the overall surface of the screen 6 formed on the individual photographic paper 4 by means of the second thermal head 20. Namely, after the individual photographic paper 4 has been formed by cutting the photographic paper 2, the screen protective layer 5 is formed on the overall surface of the screen 6 formed on the individual photographic paper 4.
Suppose that, after the screen protective layer 5 has been formed on the overall surface of the screen 6 formed on the photographic paper 2, the photographic paper 2 is cut so as to manufacture the individual photographic paper 4. In this case, if a position to be cut of the photographic paper 2 is shifted forward from the rear edge 6a of the screen 6, a part of the screen protective layer 5 remains on the rearward photographic paper 2. Under this state, it is difficult to form a rearward screen 6 adjacent to the screen 6 on the photographic paper 2.
On the other hand, according to the present invention, the individual photographic paper 4 is firstly formed by cutting the photographic paper 2. Following thereto, the screen protective layer 5 is formed on the overall surface of the screen 6 formed on the individual photographic paper 4. Thus, there is no possibility that a part of the screen protective layer 5 remains on the rearward photographic paper 2. Thus, instead of forming the screen protective layer 5 with a predetermined margin that is left from the rear edge 6a of the screen 6, the screen protective layer 5 can be formed on the overall surface of the screen 6 on the individual photographic layer 4. As a result, there is no possibility that a part of the screen 6 might be exposed to the outside, whereby a light resistance of the screen 6 can be reliably retained, which results in maintaining an image quality of the screen 6.
In addition, according to this embodiment, since no margin is provided between the adjacent screens 6 on the photographic paper 2, the individual photographic paper 4 can be manufactured by cutting only once the photographic paper 2 by the cutting means 19 at the rear edge 6a of the screen 6. Thus, when the cutting means 19 is formed of a cutter, the abrasion of the cutter can be restrained, whereby a life duration of the cutter can be elongated.
In addition, in this embodiment, when the screen 6 is formed on the photographic paper 2 by the first thermal head 10, the image of the screen 6 formed on the photographic paper 2 is gradually thinned from a part near to the rear edge 6a of the screen toward the rear edge 6a of the screen 6. However, not limited to the rear edge 6a of the screen 6, the image of the screen 6 formed on the photographic paper 2 may be gradually thinned from parts near to peripheral edges of the screen 6 toward the respective peripheral edges of the screen 6.
According to this alternative example, as shown in FIGS. 1 and 4, when a screen 6 is formed on the photographic paper 2 by the first heating means 10, an amount of energy for heating each of the Y layer 15 (see, FIG. 2), the M layer 16, and the C layer 17 are gradually decreased from a part near to the rear edge 6a of the screen 6 toward the rear edge 6a of the screen 6, based on the image data. The respective Y colorant, the M colorant, and the C colorant are transferred onto the photographic paper 2 by sublimation in accordance with an amount of heating energy supplied from the first thermal head 10. Thus, areas of the Y layer 15, the M layer 16, and the C layer 17 of the ink ribbon 14 are selectively, sequentially heated by the first thermal head 10 based on the image data. Meanwhile, the screen 6 is formed on the photographic paper 2 such that the image is gradually thinned from a part near the rear edge 6a of the screen 6 toward the rear edge 6a of the screen 6. An area in which the amount of heating energy supplied from the first thermal head 10 is gradually decreased is preferably in a range of 0.5 mm or less from the rear edge 6a over all the width of the photographic paper 2. In this case, a range in which the image is thinned from a part near to the rear edge 6a is minimally restrained. In addition, even when a part of the image of the screen 6 overlaps with an image of a rearward screen 6 adjacent thereto, the part of the image of the screen 6 is prevented from appearing on the rearward screen 6.
Then, as shown in FIG. 6(a), with the use of the ink ribbon 30, two screens 6 each having an image are continuously formed on the photographic paper 2, by sequentially transferring a Y colorant, a M colorant, and a C colorant onto the photographic paper 2 by sublimation by means of the first thermal head 10, without providing a margin between the adjacent screens 6. In this case, the photographic paper 2 and a Y layer 31 of the ink ribbon 30 (see, FIG. 5) are arranged in position in the first place. Then, the first thermal head 10 is moved downward toward a platen roll 18 by a first elevating means 13 connected to the first thermal head 10, so that the first thermal head 10 is brought into contact with the platen roll 18 through the photographic paper 2 and the ink ribbon 30.
When the Y colorant is transferred onto the photographic paper 2 by sublimation, an amount the Y colorant to be transferred onto the photographic paper 2 by sublimation is gradually decreased from a part near to a rear edge 6a of each of the screens 6 toward the rear edge 6a of each of the screens 6. Thus, each of the screens 6 is formed on the photographic paper 2 such that the image is gradually thinned from a part near to the rear edge 6a of the screen 6 toward the rear edge 6a of the screen 6. An area in which the colorant is gradually decreased is preferably in a range of 0.5 mm or less from the rear edge 6a over all the width of the photographic paper 2. In this case, a range in which the image is thinned from a part near to the rear edge 6a of the screen 6 is minimally restrained. In addition, even when a part of the image of the screen 6 overlaps with the image of the rearward screen 6 adjacent thereto, the part of the image of the screen 6 is prevented from appearing on the rearward screen 6.
Then, similarly to the method for transferring the Y colorant by sublimation, the M colorant and the C colorant are sequentially transferred onto the photographic paper 2 by sublimation, so that two screens 6 each having an image are continuously formed on the photographic paper 2 (see, FIG. 6(a)).
Then, as shown in FIG. 6(b), the photographic paper 2 is cut by a cutting means 19 at a rear edge 6a of each of the screens 6, so that two individual photographic papers 4 (a first individual photographic paper 4a and a second individual photographic paper 4b) each having the one screen 6 are manufactured.
As described above, the distance between the first thermal head 10 and the cutting means 19 is 50 mm or less, preferably 20 mm or less. Namely, the cutting means 19 is positioned relatively nearer to the first thermal head 10. Thus, the photographic paper 2, which is precisely positioned with respect to the first thermal head 10, is sent to the cutting means 19 while the precise positioning is being maintained. Therefore, the photographic paper 2 can be precisely cut by the cutting means 19 at the rear edge 6a of each of the screens 6 on the photographic paper 2.
Then, as shown in FIG. 1, the first individual photographic paper 4a and the second photographic paper 4b (see, FIG. 6(b)) are sequentially placed on a conveyor 26a of a conveying means 26. Thereafter, the conveyor 26a is driven by a driving part 26b of the conveying means 26, so that the first individual photographic paper 4a and the second individual photographic paper 4b are sequentially conveyed to a position below a second thermal head 20. During this operation, a screen protective ribbon 24 wound on a screen-protective-ribbon supply roll 21 (see, FIG. 3) is unwound therefrom, and the screen protective ribbon 24 is sent to the second thermal head 20.
Then, as shown in FIG. 6(c), with the use of the screen protective ribbon 24, a screen protective layer 5 is formed on an overall surface of the screen 6 of the first individual photographic paper 4a, by thermally transferring a screen protective film 25 onto the overall surface of the screen 6 of the first individual photographic paper 4a by means of the second thermal head 20. In this case, the first individual photographic paper 4a and the screen protective film 25 of the screen protective ribbon 24 are arranged in position in the first place. Then, as shown in FIG. 1, the second thermal head 20 is moved downward toward the conveyor 26a of the conveying means 26 by a second elevating means 23 connected to the second thermal head 20, so that the second thermal head 20 is brought into contact with contact with the conveyor 26a of the conveying means 26 through the first individual photographic paper 4a and the screen protective ribbon 24.
Then, the conveyor 26a is driven by the driving part 26b of the conveying means 26, so that the first individual photographic paper 4a and the screen protective ribbon 24 on the conveyor 26a are sent forward. During this operation, the screen protective ribbon 24 is heated by the second thermal head 20, so that the screen protective film 25 is thermally transferred from the screen protective ribbon 24 onto an overall surface of the screen 6 formed on the first individual photographic paper 4a. At this time, the first individual photographic paper 4a is sent forward by a distance corresponding to the one screen 6 formed on the first individual photographic paper 4a, and the screen protective ribbon 24 is sent forward (to the side of the screen-protective-ribbon withdrawal roll 22) by a distance corresponding to the one screen 6.
Then, the second thermal head 20 is moved upward by the second elevating means 23 so as to be away from the conveyor 26a of the conveying means 26. In this manner, the screen protective layer 5 is formed on the overall surface of the screen 6 formed on the first individual photographic paper 4a (see, FIG. 6(c)).
Then, the second individual photographic paper 4b and a rearward screen protective film 25 of the screen protective ribbon 24 are arranged in position. Thereafter, similar to the method for forming the screen protective layer 5 on the overall surface of the screen 6 on the first individual photographic paper 4a, a screen protective layer 5 is formed on an overall surface of the screen 6 on the second individual photographic paper 4b.
According to this embodiment, after the individual photographic papers 4a and 4b have been formed by cutting the photographic paper 2, the screen protective layers 5 are respectively formed on the overall surfaces of the screens 6 formed on the individual photographic papers 4a and 4b. Suppose that, after the screen protective layer 5 has been formed on the overall surface of each the screens 6 formed on the photographic paper 2, the individual photographic papers 4a and 4b are manufactured by cutting the photographic paper 2. In this case, if a position to be cut of the photographic paper 2 is shifted forward from the rear edge 6a of the screen 6 on the rear individual photographic paper 4b, a part of the screen protective layer 5 remains on a the rearward photographic paper 2. Under this state, it is difficult to form a rearward screen 6 adjacent to the screen 6 on the photographic paper 2.
On the other hand, according to the present invention, the individual photographic papers 4a and 4b are firstly formed by cutting the photographic paper 2. Following thereto, the screen protective layers 5 are formed on the overall surfaces of the individual photographic papers 4a and 4b. Thus, there is no possibility that a part of the screen protective layer 5 remains on the rearward photographic paper 2. Thus, instead of forming the screen protective layer 5 with a predetermined margin that is left from the rear edge 6a of the screen 6 on the rearward individual photographic paper 4b, the screen protective layer 5 can be formed on the overall surface of the screen 6 on the individual photographic layer 4b. As a result, there is no possibility that a part of the screen 6 might be exposed to the outside, whereby a light resistance of the screen 6 can be reliably retained, which results in maintaining an image quality of the screen 6.
In addition, according to this embodiment, it takes relatively a longer period of time for the screen protective films 25 to be thermally transferred onto the overall surfaces of the screens 6 formed on the respective individual photographic papers 4a and 4b by the second thermal head 20, while the Y colorant, the M colorant, and the C colorant are being transferred onto the photographic paper 2 by sublimation by means of the first thermal head 10. Namely, the screen protective film 25 is reliably heated by the second thermal head 20 for relatively a longer period of time so as to be thermally transferred onto the overall surface of the screen 6. Thus, the screen protective layers 5 of a high quality can be formed on the overall surfaces of the screens 6 formed on the respective individual photographic papers 4a and 4b.
Further, as described above, when the screens 6 are formed by transferring the Y colorant, the M colorant, and the C colorant by sublimation, the photographic paper 2 is moved forward and rearward in order for the sublimation transfer of the Y colorant, the M colorant, and the C colorant. On the other hand, when the screen protective layer 5 is formed on the overall surface of the screen 6, each of the individual photographic papers 4a and 4b is not moved rearward. Suppose that the photographic paper 2 on which the screens 6 have been formed by the first thermal head 10 is sent to the second thermal head 20, without cutting the photographic paper 2, so as to form the screen protective layers 5. In this case, because of the difference in movement of the photographic paper 2 relative to the respective thermal heads, there is a possibility that the photographic paper 2 might be distorted and/or strained between the first thermal head 10 and the second thermal head 20, resulting in deterioration of a quality of the screens 6 formed on the photographic paper 2.
On the other hand, according to this embodiment, after the screens 6 have been formed on the photographic paper 2 by the first thermal head 10, the individual photographic papers 4a and 4b are manufactured by cutting the photographic paper 2 by the cutting means 19, and then the individual photographic papers 4a and 4b are sent to the second thermal head 20. Thus, there is no possibility that the photographic paper 2 is distorted and/or strained between the first thermal head 10 and the second thermal head 20. Therefore, a quality of the screens 6 formed on the photographic paper 2 can be reliably retained.
In this embodiment, when each of the screens 6 is formed on the photographic paper 2 by the first thermal head 10, the image of the screen 6 formed on the photographic paper 2 is gradually thinned from a part near to the rear edge 6a of the screen 6 toward the rear edge 6a of the screen 6. However, not limited to the rear edge 6a of the screen 6, the image of the screen 6 formed on the photographic paper 2 may be gradually thinned from parts near to peripheral edges of the screen 6 toward the respective peripheral edges of the screen 6.
As shown in FIG. 8(a), two screens 6 each having an image are continuously formed on a photographic paper 2. Then, as shown in FIG. 8(b), with the use of a cutting means 19 (see, FIG. 1), the photographic paper 2 is cut at every two screens each having an image, i.e., at a rear edge 6a of the rearward screen 6 of the two screens 6. Thus, a multiple screen photographic paper 7 composed of the two screens 6 each having an image is manufactured. Then, the multiple screen photographic paper 7 is placed on a conveyor 26a of a conveying means 26. Then, the conveyor 26a is driven by a driving part 26b of the conveying means 26, so that the multiple screen photographic paper 7 is conveyed to a position below a second thermal head 20 (see, FIG. 1). During this operation, as shown in FIG. 1, a screen protective ribbon 34 (see, FIG. 7) wound on a screen-protective-ribbon supply roll 21 is unwound therefrom, and the screen protective ribbon 24 is sent to the second thermal head 20. As shown in FIG. 7, a plurality of screen protective films 35 are formed on one surface of the screen protective ribbon 34. Each of the screen protective film 35 has dimensions corresponding to those of two screens 6 each having an image.
Then, as shown in FIG. 8(c), with the use of the screen protective ribbon 34, the screen protective film 35 is thermally transferred onto overall surfaces of the two screens 6 on the multiple screen photographic paper 7, so that a screen protective layer 8 is formed thereon. In this case, the multiple screen photographic paper 7 and the screen protective film 35 of the screen protective ribbon 34 are arranged in position in the first place. Then, as shown in FIG. 1, the second thermal head 20 is moved downward toward a conveyor 26a of a conveying means 26 by a second elevating means 23 connected to the second thermal head 20, so that the second thermal head 20 is brought into contact with the conveyor 26a of the conveying means 26 through the multiple screen photographic paper 7 and the screen protective ribbon 34.
Then, the conveyor 26a is driven by the driving part 26b of the conveying means 26, so that the multiple screen photographic paper 7 and the screen protective ribbon 34 on the conveyor 26a are sent forward. During this operation, the screen protective ribbon 34 is heated by the second thermal head 20, so that the screen protective film 35 is thermally transferred from the screen protective ribbon 34 onto the overall surfaces of the two screens 6 formed on the multiple screen photographic paper 7. At this time, the multiple screen photographic paper 7 is sent forward by a distance corresponding to the two screens 6 formed on the multiple screen photographic paper 7, and the screen protective ribbon 34 is sent forward (to the side of a screen-protective-ribbon withdrawal roll 22) by a distance corresponding to the two screens 6.
Then, the second thermal head 20 is moved upward by the second elevating means 23 so as to be away from the conveyor 26a of the conveying means 26. In this manner, the screen protective layer 8 is formed on the overall surfaces of the two screens 6 formed on the multiple screen photographic paper 7 (see, FIG. 8(c)).
Then, with the use of a second cutting means (not shown), the multiple screen photographic paper 7 on which the two screens 6 have been formed is cut for each screen 6, so that there are manufactured individual photographic papers 7a and 7b on which screen protective layers 8a and 8b are respectively formed on the respective screens 6 (see, FIG. 8(d)).
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