JPH01560A - image recording device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an image recording method using a photosensitive material coated on a support with a substance on which an image formed by imagewise exposure is fixed by pressure. Concerning a recording device: - In detail, an image recording device that uniformly clamps and presses the photosensitive material on which an image is recorded by a pair of pressure rollers, fixes and visualizes the image, and obtains a high-quality image. Regarding.

[Background of the Invention 1 As an example of an image recording material using microcapsules encapsulating a photosensitive composition, for example, Japanese Patent Laid-Open No. 57-179
A photosensitive material using a synthetic polymer resin wall capsule containing a vinyl compound, a photopolymerization initiator, and a colorant precursor is known as disclosed in Japanese Patent No. 836. In this photosensitive material, microcapsules are imagewise cured by exposure to light, then pressure is applied to rupture the uncured microcapsules, and a color image is formed from the released colorant precursor. It has the characteristic that a high quality image 5 can be obtained through processing. Of course,
It has been pointed out that this light-sensitive material has a disadvantage in that it has a significantly lower photo-sensitivity than light-sensitive materials using silver halide such as photographic emulsions.

Therefore, by improving these drawbacks and achieving high photosensitivity,
A new photosensitive material that makes it possible to obtain high-quality images through simple dry processing has been developed and a patent application has been filed by the present applicant (see Japanese Patent Laid-Open No. 61-275742).

In this light-sensitive material, at least a photosensitive silver halide, a reducing agent, a polymerizable compound, and a color image-forming substance are coated on a support. It is encapsulated in microcapsules.

Regarding an image recording device that records images using such a photosensitive material, there is a patent application filed in Japanese Patent Application No.
It is disclosed in detail in No.-287492. That is,
In this image recording device, first, imagewise exposure is performed to form a latent image on the photosensitive material.Next, the photosensitive material is developed by heating to remove the polymerizable compound in the area where the latent image is present. The microcapsules are hardened by polymerizing to produce a polymer compound.

Finally, this photosensitive material and an image-receiving material having an image-receiving layer to which a color image-forming substance can be transferred are stacked and pressed together to rupture at least a portion of the microcapsules in areas where no latent image exists, thereby forming a color image. A forming substance is transferred to the image receiving material to form a visible image.

Incidentally, in the image recording apparatus, in order to accurately transfer a color image forming substance onto an image-receiving material, a photosensitive material and an image-receiving material are overlapped and pressed under high pressure through a pair of pressure ports.

In this case, the pressure roller is constructed to be quite long so as to sufficiently cover the width of the photosensitive material and the image receiving material. Therefore, when both ends of one pressure roller are pressed against the other pressure roller by a spring or the like, only the two edges of the pressure roller come into pressure contact due to the deflection that occurs in the pressure roller. As a result, sufficient pressing force is not applied to the vicinity of the center of the photosensitive material, and there is therefore a concern that a situation may occur in which the color image forming substance is not accurately transferred to the image receiving material.

Therefore, an attempt has been made to correct the overall deflection of the pressure roller by pressing only the center portion of the pressure roller using a backup roller whose central portion is formed of a large-diameter cylindrical shape. However, even in this case, since the central large diameter portion of the backup roller is bent in the longitudinal direction, only the both end portions of this central large diameter portion press the pressure roller excessively, causing the pressed pressure roller to come into contact with the pressure roller. As a result of the depression of the portion, the pressing force of the pressure roller is not uniform between the portion and other portions, resulting in the drawback that the color image material is not accurately transferred to the image-receiving material.

[Object of the Invention] The present invention has been made to overcome the above-mentioned disadvantages, and uses a photosensitive material in which a material on a support is coated on which an image formed by imagewise exposure is fixed by pressure. An image recording device that forms an image by pressurizing the photosensitive material using a pressurizing hole, the device having a predetermined center portion shaped like a column and gradually decreasing in diameter toward both ends. By configuring the central part of the pressure roller to be pressed by a backup roller of The purpose of the present invention is to provide an image recording device that enables the following.

[Means for Achieving the Object] In order to achieve the above-mentioned object, the present invention uses a photosensitive material in which an image produced by imagewise exposure is coated on a support with a substance that can be fixed by pressure. An image recording device for obtaining a visible image, the image recording device having a pair of pressure rollers for pressurizing the photosensitive material, the pressure roller of at least one of the pair of pressure rollers being A backup roller is disposed on the back surface, the center of which is cylindrical, and the diameters of both ends gradually become smaller. It is characterized in that it is configured to press against the pressure roller.

The following photosensitive materials can be used in the image recording apparatus of the present invention.

For example, Japanese Patent Application Laid-open No. 57-1999, which was filed by the applicant mentioned above,
There is a type of photosensitive material disclosed in Japanese Patent No. 179836 in which a polymerizable compound is imagewise cured by imagewise exposure and then pressure is applied to obtain a visible image. This photosensitive material has a synthetic polymer resin wall capsule containing a vinyl compound, a photopolymerization initiator, and a colorant precursor supported on a support.

Another example is a type in which a visible image is obtained by applying pressure after performing wet development in which a latent image generated by imagewise exposure is preliminarily developed with heat. Examples of such materials include those disclosed in Japanese Patent Laid-Open No. 61-278849 or Japanese Patent Application No. 61-53881 filed by the present applicant. The material disclosed in JP-A No. 61-278849 is a material in which a color image-forming substance is transferred to an image-receiving material having an image-receiving layer after thermal development to obtain an image on the image-receiving material. is coated with at least a photosensitive silver halide, a reducing agent, a polymerizable compound, and a color image-forming substance, and at least the polymerizable compound and the color image-forming substance are encapsulated in the same microcapsule. Furthermore, the material disclosed in the above-mentioned Japanese Patent Application No. 61-53881 is one in which an image is obtained on a photosensitive material without using an image-receiving material, that is, an image-receiving layer is provided on the photosensitive material itself, and silver halide , contains a reducing agent, a polymerizable compound, and two types of substances that cause a coloring reaction when in contact with each other. Among the substances that cause a coloring reaction, one substance and the polymerizable compound are housed in microcapsules, and the coloring reaction occurs. Among the substances that cause this, other substances have a photosensitive layer on the support that is present outside the microcapsules containing the polymerizable compound.

[Embodiments] Next, preferred embodiments of the image recording apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In this embodiment, the photosensitive material is one that requires a heat development process, and is of a type in which an image is transferred and formed on an image receiving material having an image receiving layer.

In FIG. 1, reference numeral 10 indicates an image recording apparatus according to this embodiment. In this case, the housing 12 constituting the image recording device 10 includes a photosensitive material supply section 13 that stores the photosensitive material A, an image exposure section 15 that reads image information carried on the document S, and a heating section for heating the photosensitive material A. A heat developing section 17 performs processing, a superimposing section 19 superposes image receiving paper C on photosensitive material A, a pressure transfer section 21 that presses photosensitive material A and image receiving paper C, and transfers image receiving paper C from photosensitive material A. A peeling section 23 for peeling and a fixing section 25 for fixing the image receiving paper C are provided, respectively.

A transparent supporting glass plate 14 on which a document S is placed is disposed on the upper surface of the housing 12, and the supporting glass plate 14 is moved over an opening 16 defined in the upper surface of the image exposure section 15 by a transport means (not shown). It is possible to move back and forth in the direction of the arrow. The image exposure section 15 includes a light source 18 that illuminates the document S through the opening 16 and a condensing optical system 20, and these are surrounded by a partition wall 22.

The photosensitive material supply section 13 is provided in the upper part of the housing 12 and is held in a light-tight manner by a partition wall 26 . A magazine 30 wound with the photosensitive material A is loaded into the photosensitive material supply section 13 via a cover member 28 attached to the upper surface of the housing 12 and which can be freely opened and closed. The photosensitive material A has at least a photosensitive silver halide, a reducing agent, a polymerizable compound, and a color image-forming substance coated on a support, in which at least the polymerizable compound and the color image-forming substance are the same. It is encapsulated in microcapsules.

The photosensitive material supply section 13 has first to fortieth pairs 32a that transport the photosensitive material A from the magazine 30 to the image exposure section 15.
to 32d. In this case, a cutter 34 for cutting the photosensitive material A into predetermined lengths is disposed between the first and twentieth pairs 32a and 32b. Also, the 3rd and 40th
An exposure opening 36 defined on the bottom surface of the partition wall 22 surrounding the image exposure section 15 faces between the -R pairs 32c and 32d.

A heat developing section 17 surrounded by a heat insulating partition wall 38 is disposed below the image exposing section 15, and the photosensitive material A is passed through the image exposing section 15 into the heat developing section 17. It is carried in via the 60th pair 32e and 32f. The heating and developing section 17 includes a hollow cylindrical heating drum 44 containing a halogen lamp 42 and an endless belt 46 that slides on the outer periphery of the heating drum 44, and pinches and conveys the photosensitive material A in a heated state.

The photosensitive material A discharged from the heat developing section 17 is conveyed to the overlapping section 19 via the 70th pair 32g. The overlapping part 19 has a Y-shaped guide plate 50, and this Y-shaped guide plate 50 is connected to a first loading path 52a close to the 70th pair 32g and close to the 80th pair 32h. the second loading path 52b, and the first and second loading paths 52a.
.

On the other hand, a cassette 56 for storing image-receiving paper C is loaded into a lower corner portion of the housing 12. In this case, cassette 5
A paper feed roller 58 is disposed above the paper feed roller 58, and the image receiving paper C is fed from the 80th pair 32h to the 2m inlet path 52b of the Y-shaped guide plate 50. be done. A manual feed port 60 is defined in the upper part of the cassette 56 in the housing 12, and from this manual feed port 60, the image receiving paper C is fed to the second m inlet path 52b via the tenth roller pair 32j. is also possible.

A pressure unit 66 including a pressure transfer section 21 and a peeling section 23 is disposed behind the 90th pair 32i. This pressurizing unit 66, as shown in FIGS. 2 and 3,
A first support plate 68a fixed to the housing 12
, 68b, and second support plates 72a, 72b, each one end of which is rotatably supported via a spindle 70 with respect to the first support plates 68a, 68b. first support plate 68a,
A first pressure roller 74 that is rotationally driven by a rotational drive source (not shown) is supported by 68b via a shaft 76.

Further, a second pressure roller 80 is rotatably supported by the second support plates 72a and 72b via a shaft 78.

The first and second pressure rollers 74 and 80 are made of SK material or SCM material that is induction hardened, the hardening depth is 5+n+a or more from the roller circumferential surface, and the hardness is HRC 60 or more), and the outer periphery is hard chrome plated. It is formed by applying.

Here, the ends of the first support plates 68a, 68b opposite to the other ends of the second support plates 72a, 72b have holder portions 82a.
, 82b are formed, and bolts 86a, 86b are attached to the holder portions 82a, 82b through holes 84a, 84b formed at the other ends of the second support plates 72a, 72b. In this case, a spring 90a is provided between the flanges 88a, 88b of the poles 86a, 86b and the other ends of the second support plates 72a, 72b.

90b is interposed, and the other ends of the second temporary supports 72a, 72b are urged toward the holder portions 82a, 82b of the first support plates 68a, 68b by the springs 90a, 90b. Therefore, the second pressure roller 80 is pressed against the first pressure roller 74 by the elastic force of the springs 90a and 90b.

On the other hand, one end of each of the first holding plates 94a, 94b is rotatably supported by the first supporting plates 68a, 68b via a support shaft 92, and the first holding plates 94a, 194b have a
A backup roller 96 is rotatably supported via a shaft 98. In this case, the first backup roller 96 is formed into a substantially cylindrical shape in which the section 2 at the center has the same diameter, and the diameters of both sides gradually become smaller toward the ends and are integrally shaped into a substantially truncated cone shape. is formed. In addition, at this time, the joining part of the cylindrical part and the truncated conical bottom peripheral part is rounded and the radius of curvature R is set to be 50 mm or more (.

Here, the holder parts 100a and 100b formed on the first support plates 68a and 68b include first holding plates 94a and 94b.
Bolts 104a and 104b are attached through holes 102a and 102b drilled at the other end, and these bolts 10
4a.

A spring 108a is provided between the flange portions 106a, 106b of 104b and the other end portions of the first holding plates 94a, 94b.
, 108b are interposed. Therefore, the first holding Fi
The other ends of 94a and 94b are springs 108a and 108.
b, the first back-up roller 96 is pressed against the back surface of the first pressure roller 74. Note that the first holding plate 94
A cleaning shoe 110 that comes into sliding contact with the first pressure roller 74 is attached to the support shafts 92 of a and 94b via a take-out plate 112.

Similarly, one end of each of the second holding plates 116a, 116b is rotatably supported on the second supporting plates 72a, 72b via a support shaft 114, and a shaft 11B is supported on the second holding plates 116a, 116b. A second backup roller 120 is rotatably supported via the second backup roller 120. In this case, the second backup roller 120 is formed in the same shape as the first backup roller 96. Note that these backup rollers 96
and 120 are preferably made of the same material as the first and second pressure rollers 74, 80.

Here, the holder parts 122a and 122b formed on the second support plates 72a and 72b have second holding plates 116a and 1
Bolts 126a, 126b are attached through holes 124a, 124b bored at the other end of 16b.

Springs 130a, 130b are interposed between the flange portions 128a, 128b of 126b and the other ends of the second holding plates 116a, 116b. Therefore, the other ends of the second holding plates 116a and 116b are connected to the spring 13.
Holder part 122a, ! by 0a, 130b. 22b
The second back-up roller 12
0 comes into pressure contact with the back surface of the second pressure roller 80. Note that a shoe 132 that slides on the second pressure roller 80 is attached to the mounting plate 13 on the support shaft 114 of the second holding plates 116a and 116b.
It is attached via 4.

On the other hand, a blade 136 rotatably supported by the first support plates 68a and 68b is disposed between the 90th roller pair 32i and the second pressure roller 80 shown in FIG. The other end of the blade 136 is tensioned by a spring 138 so that one end comes into sliding contact with the second pressure roller 80 .

Note that a guide plate 140 is arranged opposite to this blade 136.

A 110th pair 32k is further disposed on the first support plates 68a, 68b. In this case, a guide plate 142 is provided between the first and second pressure rollers 74 and 80 and the 110th roller pair 32. Also, No. 110-La vs. 32
Behind the wheel is a first Y-shaped guide plate.
and second discharge paths 144a, 144b are provided.

These first and second discharge paths 144a, 14
A peeling portion 23 is formed between the 110th and 4b pairs 32k.
A peeling claw 146 having a pointed end 145 facing toward the support shaft 1
It is rotatably supported by first support plates 68a and 68b via 48.

The first unloading path 144a has the 12th to 140th pairs 32
A waste tray 150 is disposed below the irradiating material supply section 13 via β to 32n.

In this case, the photosensitive material A is carried into the waste tray 150. Further, a take-out tray 152 disposed at the lower corner of the housing 12 is connected to the second m outlet path 144b via the 15th and 160th pair 320.32p,
The image-receiving paper C is taken out to this take-out tray 152. Note that a fixing section 25 having an ultraviolet lamp 154 is disposed between the 15th and 160th pairs 32o and 32p.

The image recording apparatus according to this embodiment/aspect is basically constructed as described above, and its operation and effects will be explained next.

First, a document S carrying image information is placed on a support glass plate 14.
is placed thereon, and this original S is conveyed along with the support glass plate 14 in the sub-scan direction in the direction of the arrow by a conveying means (not shown). At this time, the light source 18 in the image exposure section 15 is turned on, and the illumination light emitted from the light source 18 is irradiated onto the document S from the opening 16 through the support glass plate 14. On the other hand, the photosensitive material A pulled out from the magazine 30 loaded in the photosensitive material supply section 13 is conveyed by the first to fortieth pair 32a to 32d, and is transported along the exposure opening 36 of the image exposure section 15. It moves at the same speed as the supporting glass plate 14.

Therefore, the reflected light from the image information carried on the original S passes through the condensing optical system 20 and is irradiated from the exposure opening 36 in the main scanning direction onto the photosensitive material A, forming a latent image on the photosensitive material. Ru. Note that the photosensitive material A pulled out by a predetermined amount from the magazine 30 is appropriately cut by a cutter 34.

Next, the photosensitive material A that has undergone the exposure process is exposed to the fifth and sixth photosensitive materials.
The toner is carried into the heat developing section 17 via the 0-ra pair 32e and 32f. In the heat development section F, the photosensitive material A is conveyed while being held between a heating drum 44 and an endless belt 46, and during this time, a heat development process is performed using a halogen lamp 42. As a result, the polymerizable compound in the area where the latent image is present is polymerized, and the predetermined microcapsules in the photosensitive material A are hardened.

The photosensitive material A that has been subjected to the heat development process is then subjected to the 70th
- The Y-shaped guide plate 50 is carried into the overlapping portion 19 from the first carrying-in path 52a via the pair 32g. On the other hand, the image recording apparatus 10 is loaded with a cassette 56 containing image-receiving paper C, and the image-receiving paper C is fed to the Y-shaped guide plate 50 through the 80th-ra pair 32h by the paper feeding roller 58. 2 is carried into the overlapping section 19 from the carrying-in path 52b.

As a result, the image receiving paper C comes into contact with the lower surface of the photosensitive material A at the overlapping portion 19.

In this case, the leading edge of the photosensitive material A is 90th
- The overlapping state shall be adjusted so that it protrudes toward the pair 32i side. The image-receiving paper C may be fed to the stacking section 19 by an operator from a manual feeding port 60 opened at the side of the housing 12 via the tenth roller pair 32j.

The photosensitive material A and the image-receiving paper C, which are carried out in a stacked state from the carrying-out path 54 of the stacking section 19, are transferred to the 90th-ra pair 3.
2i, it is carried into the pressure transfer section 21. in this case,
In the pressure transfer section 21, as shown in FIGS. 2 and 3, the first and second pressure rollers 74 and 80 are in pressure contact with each other due to the elastic force of springs 90a and 90b. The photosensitive material A is placed between the second pressure rollers 74 and 80.
and receiver paper C are introduced. Note that the second pressure roller 8
The blade 13 is attached to the outer periphery of the blade 13 by a spring 138.
6 are in contact with each other, the superimposed photosensitive material A and image receiving paper C suitably enter between the first and second pressure rollers 74 and 80 without being peeled off.

When the superimposed photosensitive material A and image receiving paper C are pressed together by the first and second pressure rollers 74, 80, the microcapsules in the portions of the photosensitive material A where no latent image exists are ruptured, forming a color image. The material is transferred to receiver paper C to form an image.

Here, both ends of the first and second pressure rollers 74.80 are connected to springs 90a and 90b via shafts 76.78.
At the same time, the back surfaces of the first and second pressure rollers 74.80 are pressed by the springs 108a, 108b and 130a via the shafts 98.118 by the first and second back-up rollers 96.120. , 130
It is pressed by the elastic force of b. In this case, the first and second backup rollers 96.120 are connected to the spring 1
Due to the elastic forces of 08a, 108b and 130a, 130b, they are slightly deformed into an upwardly concave shape and a downwardly concave shape, respectively. At this time, by setting the elastic force appropriately, the first
Press the second back-up roller 96.120 so that the side surface of the truncated cone and the side surface of the central cylindrical portion, that is, the entire side surface, contact the back surface of the first and second pressure rollers 74.80. It is possible to do so. Therefore, the photosensitive material A and the image receiving paper C are pressed together in an optimal state.

In this case, according to experiments conducted by the inventors, the contact area between the pressure roller and the bulk-up roller is small (each has a length of 10 mm or more), so that the first and second pressure rollers 74.
It has been confirmed that there is no deformation that would lead to the collapse of 80. As a result, the image information recorded on the photosensitive material A is evenly and accurately transferred onto the image receiving paper C.

It is known that there is a relationship shown in FIG. 4 between the pressure applied to the photosensitive material A and the image-receiving paper C and the density of the image transferred onto the image-receiving paper C by the pressure. . That is, the density of the image transferred onto the image-receiving paper C increases approximately in proportion to the pressure applied, but it does not change when a pressure equal to or greater than a predetermined amount is applied. Therefore, based on this relationship, the springs 90a, 90b, 1
By adjusting 08a, 108b and 130a, 130b, an optimal pressing force can be applied to the photosensitive material A and the image receiving paper C. In this case, if the elastic force of the spring is set so that the pressing force along the longitudinal direction of the first and second pressure rollers 74, 80 is uniform, an optimal image without unevenness can be obtained. At the same time, image unevenness caused by unevenness in the materials of the photosensitive material A and the image receiving paper C is eliminated, and the effect that the photosensitive material A and the image receiving paper C are conveyed normally without meandering can also be obtained.

In the above embodiment, the approximate dimensions of the first and second pressure rollers 74.80 and the first and second backup rollers 96.120 and the spring 90a,
90b, 108a, 108b, 130a, 13
The Hane constant of 0b is as shown in Table 1, and at this time, the first
The maximum allowable sheet width of the photosensitive material A and image receiving paper C that can be pressed together and passed by the second pressure roller 74 and 80 is approximately 30 mm.
0Im+. Reference signs L+, Lz in Table 1
, D+, Dz, and Ds are shown in FIGS. 2 and 3, respectively.

Table 1 And with the constants in Table 1) 86a, 86b, 104a
, 104b, 126a, 126b and springs 90a, 90b, 108a, 108b, 130
Adjust the elastic force of a and 130b appropriately to make the seat width 30
0 nm+ photosensitive material A and image receiving paper C were placed in the first and second
When pressure is applied by the pressure rollers 74 and 80, the pressure distribution applied to the sheet is as shown in FIG. In other words, the pressing force at the edge of the sheet is approximately 500 kg/cm2, and the pressing force at the center is approximately 600 kg/cm2.In this case, no wrinkles will occur in the sheet at all, and the entire area of the sheet will be wrinkled. Since the pressing force is more than 500 kg/cm'' across the area, the density is uniform, and as a result, the photosensitive material A
The quality of transfer from to image receiving paper C is extremely good.

Furthermore, experiments were also conducted on a sheet with a sheet width of 210 mm and a size of 182 cylinders, and it was similarly confirmed that there were no wrinkles and that the transfer quality was good. In this case, the driving torque required for the rotational drive source (not shown) that rotates the first and second pressure rollers 74 and 80 is 140 kg.
-cm.

In this way, the photosensitive material A and the image receiving paper C pressed in the pressure transfer section 2I are transferred to the 110th
- It is carried into the peeling section 23 by the pair 32k. Peeling part 2
3, the peeling claw 146 is rotated about the support shaft 148 in the direction of the arrow to perform the peeling operation between the photosensitive material A and the image receiving paper C. That is, the photosensitive material A is
9 so that its leading end protrudes beyond the image-receiving paper C, the peeling claw 146 is transported toward the first unloading path 144a by the pointed end 145 of the peeling claw 146. - On the other hand, the image-receiving paper C is separated from the photosensitive material A by the pointed end 145 of the peeling claw 146, and is conveyed to the second carry-out path 144b side.

The image receiving paper C conveyed to the second yIi exit path 144b is
The image is carried into the fixing section 25 by the 0-ra pair 320, and the image transferred to the surface thereof is fixed by the ultraviolet lamp 154. Next, this image receiving paper C is transferred to the 160th-ra pair 32p.
is carried out to the take-out tray 152. On the other hand, the photosensitive material A conveyed to the first unloading path 144a is
Waste tray 150 by 40-ra pairs 32f to 32n
It will be transported to

Incidentally, in the above-described embodiment, the backup roller is pressurized by a spring, but the pressurizing element is not limited to a spring, but may also be configured by a bolt. The embodiment is shown in FIGS. 6 and 7. That is, by removing the springs 108a, 108a, 130a, and 130b from the embodiment shown in FIGS. 2 and 3 and replacing them with bolts 150a to 150d, the pressing force of the backup rollers 96 and 120 is adjusted by the bolts 150a to 150d. It may be configured as follows. In this case, photosensitive material A with a sheet width of 300 mm
and the image receiving paper C by the first and second pressure rollers 74.80.
i! FIG. 8 shows the distribution of the pressing force applied to the sheet when it is passed through the sheet.

In other words, the pressing force at the edge of the sheet is 500 kg/cm2.
and the pressing force at the center is 900 kg/cm
”.In this state, the seat width is 300mm.
and photosensitive material A and receiver paper C with a sheet width of 210 mm.
No wrinkles were observed even when the paper was pressed by the first and second pressure rollers 74 and 80, and the transfer quality was good.

As described above, the distribution of the pressing force in the embodiment using the pressing force generated by the screwing action of the bolt (hereinafter referred to as "bolt pressing") is different from the applying pressure using the elastic force of the spring (hereinafter referred to as "bolt pressing"). Compared to the distribution of pressure force in the embodiment using spring pressure (refer to Figure 5), the height difference in pressure is large, but this is because bolt pressure is more rigid than spring pressure. It is.

Further, at this time, the driving torque required for the rotational drive source (not shown) that rotates the first and second pressure rollers 74, 80 is 200 kg-cm, which is about 50% larger than that using spring pressure. However, since the configuration using bolt pressure has the advantage of being able to configure the device at low cost, for example, a configuration using bolt pressure is adopted for low-volume production, and a configuration using spring pressure is adopted for mass production. Either configuration may be selected depending on the purpose.

[Effects of the Invention] As described above, according to the present invention, a photosensitive material in which a substance on a support is coated to which an image generated by imagewise exposure is fixed by pressure is used, and the window light material is pressed. The image formed on the photosensitive material is pressurized using a roller, and the back surface of the pressure roller is pressed by a backup roller whose central portion is cylindrical and whose side portions are truncated conical. It is configured to be fixed and visualized. In this case, since the pressure roller uniformly presses the photosensitive material by the action of the backup roller, an extremely high quality image can be obtained.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments.
For example, the shape of the backup roller may be changed to a so-called crown roll shape in which the diameter gradually increases from both ends toward the center. Various improvements and improvements may be made without departing from the gist of the present invention. Of course, the design can be changed.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an image recording device according to the present invention, FIG. 2 is a configuration diagram of a pressure unit in the image recording device according to the present invention, and FIG. 3 is a pressure transfer diagram in the image recording device according to the present invention. FIG. 4 is a characteristic diagram showing the relationship between pressurizing force and image density in the image recording apparatus according to the present invention, and FIG. FIG. 6 and FIG. 7 are explanatory diagrams of the configuration of a pressure unit and a pressure transfer section in an image recording apparatus according to another embodiment of the present invention, and FIG. FIG. 3 is an explanatory diagram of the pressure force distribution applied to the sheet in the pressure transfer section shown in FIG. IO... Image recording device 12... Housing 13... Photosensitive material supply section 14... Support glass plate 15... Image exposure section 17... Heat development section 18... Light source 19... Overlapping section 21... Pressure transfer section 23... Peeling section 25... Fixing section 30... Magazine 3
2a-32p...Roller pair 34-...Cutter 42-
・Halogen lamp 44 ・Heating drum 50 ・
・Y-shaped guide plate 56 ・Cassette 58 ・・
・Paper feed roller 66...pressure unit 68a
,68b,? 2a, 72b--Support plate 74.80...
・Pressure rollers 94a, 94b...holding plate 96・
... Backup rollers 116a, 116b... Holding plate 120... Backup roller A... Photosensitive material C... Receiving paper FIG,
5

Claims (1)

[Scope of Claims] (1) An image recording device for obtaining a visible image by pressure, using a photosensitive material on a support coated with a substance on which an image formed by imagewise exposure is fixed by pressure. The image recording apparatus has a pair of pressure rollers for pressurizing the photosensitive material, and the center portion thereof is cylindrical in shape with respect to the back surface of at least one of the pair of pressure rollers. A backup roller configured in the shape of a substantially truncated cone with a diameter gradually decreasing at both ends thereof is disposed, and the backup roller is configured to be pressed against the pressure roller with a predetermined pressing force. Features of the image recording device. (2) An image recording apparatus according to claim 1, wherein the backup roller is biased against the back surface of the pressure roller by the elastic force of a spring. (3) The image recording device according to claim 1, wherein the backup roller is biased against the back surface of the pressure roller by the pressing force generated by the screwing action of the bolt. . (4) In the device according to any one of claims 1 to 3, the joint portion between the cylindrical portion and the truncated conical portion of the backup roller has an arc shape and a radius of 50 mm.
An image recording device that is selected from mm or more. (5) An image recording apparatus according to any one of claims 1 to 3, in which the backup roller has a crown roll shape. (6) In the apparatus according to any one of claims 1 to 5, the pressure roller and/or the backup roller are made of SK material or SCM material that is induction hardened and hard chrome plated on the outer periphery thereof. An image recording device.