JPH03215858A - pressure developing device - Google Patents

Abstract

PURPOSE:To obtain an excellent output image which has no image defect by applying a voltage which has the opposite polarity from a developer to a pressure roller which is made to abut on the reverse surface of a base. CONSTITUTION:Normal paper 37 coated with developer toner 22 is made to abut on a capsule sheet 34 which has microcapsules 55 formed on the surface of the base 54. The both are conveyed and pressed against each other by an upper developing roller 39 and a lower developing roller 40. The developer toner 22 contact with microcapsules 55 on the capsule sheet 34 and is pressed to break microcapsules 57 before optical curing and their internal precursors are discharged to color by reacting on the developer toner 22. At this time, the lower developing roller 40 is applied with the voltage having the opposite polarity from the developer roller 22, so the developer toner 22 receives an electrostatic force in the direction of the normal paper 37, and consequently the development can be completed without sticking the developer toner 22 on the side of the capsule sheet 34.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a method of applying a charged color developer to at least one of a support on which an image is recorded and a photosensitive pressure-sensitive medium on which a latent image is formed by exposure. This invention relates to a pressure developing device having a pressure means for stacking the materials coated with the agent and applying pressure from both sides of the materials in this state to perform pressure development.

[Prior Art] Conventionally, as an image forming method, a dye precursor is encapsulated,
In addition, it carries microcapsules whose mechanical strength changes in response to light, and develops color on the surface of microcapsule paper that is exposed to light according to image information and any support such as plain paper selected by the user. The image recording medium formed by adhering the agent is then brought into close contact with the microcapsules other than the microcapsules whose mechanical strength has been increased by exposure to light, and the microcapsules other than the microcapsules whose mechanical strength has been increased are destroyed by pressure development. A method has been proposed in which an image is formed on an image recording medium by reacting a coloring agent.

[Problems to be Solved by the Invention] However, when attempting to obtain an image using such a method, there is a problem in that marbling-like image defects occur on the image surface. This is because when a support coated with a color developer and a microcapsule paper on which a latent image has been formed pass through a pressure developing device having pressure means made up of a pair of rollers, the developer is This occurs because the colorant is transferred to the capsule paper side.

The present invention has been made to solve the two problems, and an object of the present invention is to provide a pressure developing device capable of obtaining a good output image without image defects.

[Means for Solving the Problems] In order to achieve this object, the pressure developing device of the present invention has the following features:
A support on which an image will be recorded and a photosensitive pressure-sensitive medium on which a latent image will be formed upon exposure are coated with a charged color developer on at least one side, and the two are placed one on top of the other, and in this state pressure is applied from both sides of the medium. It has a pressure means for performing pressure development by adding
A voltage having a polarity opposite to that of the charged color developer is applied to the pressure means on the support side.

Further, the pressure means is composed of a pair of pressure rollers that sandwich the support and the photosensitive pressure-sensitive medium, and the pressure roller that applies pressure from the photosensitive pressure-sensitive medium side is grounded or a charged color developer. It is more effective if the same polarity voltage is applied.

[Function] According to the present invention having the configuration described above, a charged color developer is coated on at least one of the support on which an image is recorded and the photosensitive pressure-sensitive medium on which a latent image is formed by exposure. be done. Thereafter, they are stacked one on top of the other, and in this state, pressure is applied from both sides by pressure means to perform pressure development. At this time, since a voltage having a polarity opposite to that of the charged color developer is applied to the pressure means on the support side, it becomes difficult for the color developer to move toward the photosensitive pressure-sensitive medium. As a result, good images can always be output.

In addition, if the pressure means that applies pressure from the photosensitive pressure-sensitive medium side is grounded or the same polar voltage as the charged color developer is applied, it becomes more difficult for the color developer to move to the photosensitive pressure-sensitive medium side. .

[Example] Hereinafter, examples embodying the present invention will be described with reference to the drawings.

First, the configuration of an image recording apparatus equipped with the pressure developing device of this embodiment will be explained with reference to FIG.

The image recording device 10 is provided with a document table 12 at the top thereof, and an ejection port 1 for plain paper 37 on which an image is recorded on the side.
1 and a tray 13 for receiving the ejected plain paper 37. Inside the device 10, there is a capsule sheet 34 which is a photosensitive pressure sensitive medium having microcapsules on its surface, plain paper 37 which is a support on which an image is recorded, and a color developer on the plain paper 37. After forming a latent image by exposing the charged coating section 20 that applies the color developer toner 22 and the capsule sheet 34 to light, it is superimposed on the plain paper 37 coated with the color developer toner 22 and subjected to pressure development. and the outlet 1
1, and an exposure and development section 30 that conveys plain paper 37 on which an image has been recorded.

5. The charged application section 20 includes a toner case 21,
A developer toner 22 is stored therein. The color developer toner 22 is made by adding wax, a charge control agent, etc. to a phenol-based or salicylic acid-based color developer and turning it into powder. Inside the toner case 21, a carrier roller 24 is provided with, for example, knurled grooves on the surface of a cylinder made of aluminum or steel, and a sponge or brush-like member is provided on the surface almost close to the carrier roller 24. A charging roller 23 is provided. Both the carrying roller 24 and the charging roller 23 are grounded. Further, the counter electrode 25 is connected to the plain paper 37
It is arranged facing the carrying roller 24 with an interval of 0.3 to 1 mm (millimeter) between 1 to 1 mm.
It is connected to a positive power supply E, which generates 2 kV (kilovolts).

In the exposure and development section 30, the capsule sheet 34 is wound around a capsule sheet roll 31, driven by a guide roller 35, passed through the exposure section 33, development rollers 39 and 40, and then wound onto a capsule seal roll 38. . Developing roller 3
A fixing unit 41 that fixes the image recorded on the plain paper 37-]- and a cutter 42 that cuts the plain paper 37 on which the image is recorded into an appropriate size are provided downstream of the paper 9 and 40. There is. Plain paper 37
is wound around a plain paper roll 36, and a charging coating section 20 and an exposure/developing section 30 are arranged downstream thereof.

FIG. 2 is an enlarged view showing the pressure developing section 50 in detail. A two-part developing roller 39, which is grounded against plain paper 37 coated with a color developer, transfers the capsule sheet 3 on which a latent image is formed.
Plain paper 3 that is in contact with the back side of 4 and coated with a color developer
A lower developing roller 40 connected to a positive power source E2 is in contact with the rear surface of the developing roller 7.

Next, the operation of the image forming apparatus will be explained with reference to FIGS. 1 and 2.

The plain paper 37 sent out by the rotation of the plain paper roll 36 reaches the charged coating section 20 . The color developer l/toner 22 is frictionally charged by a charging roller 23 and a carrier roller 24 rotating in the toner case 21, and is given a negative charge. This developer toner 22 is placed on a carrier roller 23 and placed on a plain paper 37.
It is carried to a position where it faces the counter electrode 25 with the two sides in between. Since about 1 to 2 kV is applied to the counter electrode 25, the developer toner 22 flies toward the plain paper 37 in the electric field. The negatively charged developer toner 22 is uniformly applied to the plain paper 37 and sent to the pressure developing section 50 .

On the other hand, the capsule sheet 34 sent out from the capsule sheet roll 31 is exposed in the exposure section 33 with reflected light obtained by reflecting the light from the lamp 32 onto the original document to form a latent image. Further, the capsule sheets 1 and 34 are conveyed by a guide roller 35 and brought into contact with plain paper 37 at a pressure developing section 50 .

In FIG. 2, the pressure developing section is shown in detail. Plain paper 37 coated with developer toner 22 is coated with microcapsules 55.
is brought into contact with the capsule sheet 34 formed on the surface of the base material 54. Both are conveyed by a two-part developing roller 39 and a lower developing roller 40, and are pressurized with a total pressure of about 1 ton.

The developer toner 22 and the microcapsules 55 on the capsule sheet 34 are brought into contact and pressurized, and the microcapsules 57 that have not been photocured rupture, releasing the dye precursor contained therein and reacting with the developer toner 22. Color develops.

Since the photocured microcapsules 58 do not rupture, the dye precursor contained therein is not released.

When the plain paper 37 moves away from the developing roller, the developer toner 22 that develops color may be brought to the capsule sheets 1 and 34 side, but the lower developing roller 40 has the opposite color developer toner 22. Since a polar voltage is applied, the developer toner 22 receives electrostatic force in the direction of the plain paper 37, and as a result, the developer 1 and toner 22 are developed without being deposited on the capsule sheet 34 side. can finish. That is, the developer toner 22 is applied to the capsule sheet 34 side in the pressure developing section 50.
It is possible to prevent the occurrence of pixel defects caused by adhesion of particles.

The plain paper 37 on which pressure development has been completed is conveyed to the fixing unit 41 and heated at 140° C. for about 10 seconds. The plain paper 37 on which the image has been fixed by heating is cut into a predetermined size by a cutter 42 and delivered to the discharge port 11. Therefore, the amount 9 is discharged onto the top 13.

The present invention is not limited to the embodiments described in detail below, and various changes can be made without departing from the spirit thereof.

For example, in this embodiment, a negatively charged toner is used as the color developer toner, but a positively charged toner may also be used. In this case, a negative voltage is applied to the pressure roller 40.

Further, instead of the plain paper 37, the developer toner 22 may be electrostatically applied to the surface of the capsule sheet 1/34 on which the latent image is formed.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, a support coated with a color developer is brought into contact with a photosensitive pressure-sensitive medium on which a latent image is formed in a pressure developing device. It is developed, but
At this time, since a voltage of opposite polarity to the color developer is applied to the pressure roller that is brought into contact with the back surface of the support, the color developer 1 and the color developer can be developed without being taken away by the photosensitive pressure-sensitive medium. You can finish it. As a result, image defects caused by developer toner adhering to the photosensitive pressure sensitive medium 10 during pressure development can be prevented, and stable and good images can always be output.
Two remarkable effects.

[Brief explanation of drawings]

1 and 2 show an embodiment embodying the present invention. FIG. 1 is a sectional view of an image recording apparatus equipped with a pressure developing device, and FIG. 2 is an enlarged view of the pressure developing section. . In the figure, 10 is an image recording device, 11 is an ejection port, 12 is a document table, 13 is a tray, 20 is a charging applicator, 21 is a toner case, 22 is a developer toner, 23 is a charging roller, and 24 is a carrier roller. , 25 is a counter electrode, 30 is an exposure and development section, 31
3 is a capsule sheet roll, 32 is a lamp, 33 is an exposure section, 34 is a capsule sheet, 35 is a guide roller, 36 is a support roll, 37 is plain paper, 38 is a capsule sheet winding roll, 39 is an upper developing roller , 40 is a lower developing roller, 41 is a fixing unit, 42 is a cutter, 50 is a pressure developing section, 54 is a base, 55 is a microcapsule, 57 is a ruptured microcapsule, 58 is a hardened microcapsule, E+, E2 are Positive power supply, G is ground. Patent applicant Yoshihiro Yasui, President and Director of Brother Industries, Ltd.

Claims (1)

[Scope of Claims] 1. A support on which an image is recorded and a photosensitive pressure-sensitive medium on which a latent image is formed by exposure, and at least one of which is coated with a charged color developer, and the two are overlapped, In a pressure developing device that has a pressure means that performs pressure development by applying pressure from both sides in this state, a voltage of opposite polarity to the charged color developer is applied to the pressure means on the support side. Features of the pressure developing device. 2. The pressure means is composed of a pair of pressure rollers that sandwich the support and the photosensitive pressure-sensitive medium, and the pressure roller that applies pressure from the photosensitive pressure-sensitive medium side is grounded or a charged color developer. 2. The pressure developing device according to claim 1, wherein a voltage of the same polarity as is applied.