JPH03126937A - Image recorder - 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 [Field of Industrial Application] The present invention relates to a technique for improving an exposure device of an image recording apparatus using photosensitive pressure-sensitive paper.

[Conventional technology]

Conventionally, an image recording device has been used in which an exposure section exposes a light-sensitive and pressure-sensitive paper to form a latent image, superimposes the light-sensitive and pressure-sensitive paper on a color developer paper, and forms an image by developing the superposed paper under pressure. is proposed.

Such an image recording apparatus is provided with an exposure device for performing the above exposure. By the way, there are some types of originals, such as originals with only text, originals with gradation images such as text and photographs, or originals with gradation images such as only photographs, but it is difficult to record images of originals with such gradation using conventional devices. Partial sub-exposure is not possible, so either set the entire screen to photo mode (in this case, sub-expose the entire screen) or set the entire screen to standard mode (in this case, do not sub-expose the entire screen). It was one of two things.

[Problem to be solved by the invention]

However, with this conventional sub-exposure method, when recording a document containing a mixture of photos and text, the edges of the text may be missing when set to photo mode, while the images in the photo portion may appear hard when set to standard mode. The challenge was to give.

The present invention has been made to solve this problem, and it is an object of the present invention to provide an image recording apparatus that can form a clear image close to the original even if the original has a gradation image.

[Means to solve the problem]

An image recording apparatus according to the present invention is an image recording apparatus that exposes a light-sensitive pressure-sensitive paper in an exposure section to form a latent image, and then superposes the light-sensitive pressure-sensitive paper on a developer paper and develops it under pressure to form an image. When the document has a gradation image, a sub-exposure irradiation device is provided which can irradiate sub-exposure to a designated portion of the exposure section.

[Effect]

In the present invention, sub-exposure can be applied to designated areas of the exposure area, so in the case of an original containing a mixture of photographs and text, each area can be exposed with the optimum light intensity, and both areas can be exposed clearly. Images can be formed.

(Example) In order to explain the present invention more specifically, an example will be described below. Fig. 1 is a schematic cross-sectional view of a photosensitive pressure-sensitive copying machine that is capable of full-color copying. Note that photosensitive paper (photosensitive paper consisting of microcapsule paper and color developer paper) that enables such copying has been proposed in Japanese Patent Application Laid-open No. 88739/1983, and will not be described in detail here.

The photosensitive and pressure sensitive copying machine 40, which serves as an image recording device, exposes a photosensitive and pressure sensitive paper in an exposure section to form a latent image, and then superposes the photosensitive and pressure sensitive paper on developer paper and develops it under pressure to form an image. As shown in the figure, the top plate is composed of a horizontally movable original platen glass 2 and an original platen cover 1, and a desired original can be placed face down on the original platen glass 2. can. A light source consisting of a halogen lamp 3 extending in a direction perpendicular to the direction of movement of the document table glass 2 and a semi-cylindrical reflecting mirror 4 arranged to surround this lamp 3 is fixed to the upper right side of the copying machine 40. This light source irradiates light in a line toward the document table glass 2.

Therefore, the light emitted from the halogen lamp 3 can sequentially illuminate the entire surface of the document table glass 2 from the left end to the right end by moving the document table glass 2 in the left-right direction. The light emitted from the light source passes through the transparent original platen glass 2 and is reflected by the original placed on it. A document table cover 1 is provided to cover the document table. In addition, in order to use the light emitted from the halogen lamp 3 to irradiate the original with high efficiency, a beam flap 5 is arranged to the left of the light source to reflect the light that is not directly directed toward the original and use it again to irradiate the original. .

A fan 6 and a louver 7 are provided on the right side of the halogen lamp 3 to draw air in from the outside. As a result, cooling air is efficiently applied to the document table glass 2. Light emitted from the halogen lamp 3 and reflected from the document placed on the document table glass 2 passes through the filter 8 and enters the lens 9 . This filter 8 is for changing the light transmission characteristics according to the sensitivity characteristics of the microcapsule paper 37 as a photosensitive pressure sensitive paper, and adjusting the tone of the copied image. The lens 9 is attached to a lens mounting plate 10, and allows minute angle adjustment with respect to the optical path. The light focused by the lens 9 is divided into 1800 by two reflecting mirrors.
The direction is changed and an image is formed on the microcapsule paper 37 that is closely positioned below the exposure table 19. 1 on 2 reflective mirrors
is fixed to the mirror mounting plate 12, and the optical path length and focus adjustment are performed by finely adjusting the mounting position of the mirror mounting plate 12.

On the other hand, a long microcapsule paper 37 is wound around a cartridge shaft 14 and housed in a removable cartridge 13 disposed below the document platen glass 2. and the pressure developing device 20 before reaching the winding shaft 25. That is, the microcapsule paper 37 coming out from the lower part of the cartridge 13 is guided by the feed roller 15 and the tie roller 17, passes below the exposure table 19, and then is supplied to the pressure developing device 20. Thereafter, the microcapsule paper 37 that has passed through the pressure developing device 20 is guided to a peeling roller 23 and a meandering adjustment roller 24, and then wound onto a winding shaft 25. The unexposed microcapsule paper 37 after leaving the cartridge 13 is kept in an unexposed state by the light shielding cover 16.

The transport speed of the microcapsule paper 37 is controlled to be constant by the capsule paper feed roller 22, and is made to match the moving speed of the document table glass 2, so that the microcapsule paper 37 is In this case, latent images of predetermined lines of the original are sequentially formed.

Further, a developer paper cassette 32 containing cut paper type developer paper 38 is provided below the pressure developing device 20, and the developer paper 38 is taken out one by one by a half-moon roller 33, and the developer paper cassette 32 is taken out one by one by a half-moon roller 33, and the developer paper 38 is taken out one by one by a half moon roller 33. After the leading end is aligned by the registration gate 35, the paper is transported to the paper entrance of the pressure developing device 20. Reference numeral 36 is a partition plate that partitions the inside of the copying machine 40. Therefore, the microcapsule paper 37 and the color developing paper 38 are supplied to the pressure developing device 20 in a state in which they are in close contact with each other and are integrated. The pressure developing device 20 includes a small diameter roller 21 and a backup roller 31. The microcapsule surface of the microcapsule paper 37 on which the latent image is formed and the developer-coated surface of the color developer paper 38 are in contact with each other on the inside, and are held together by the small diameter roller 21 and the backup roller 3■. pressure is applied. This pressure destroys the unexposed microcapsules and forms an image on the developer paper 38.

The microcapsule paper 37 and color developer paper 38 that have come out of the pressure developing device 20 are conveyed by a capsule paper feed roller 22.
The peeling roller 23 separates the microcapsule paper 37 upwardly and the developer paper 38 in the perpendicular direction. After color development is promoted by the heat fixing device 50 and an image is formed on the developing paper 38, the developing paper 38 is conveyed to the paper discharge tray 27 with the image side facing up. The heat fixing device 50 includes a hollow heat roller 29 having a heater 30 therein, and a color developing paper feed roller 2.
8. The separated microcapsule paper 37 passes through the meandering adjustment roller 24 and is wound around the winding shaft 25.

The sub-exposure irradiation device 70 is capable of irradiating sub-exposure to a designated portion of the exposure area when the document has an image with gradation, such as when a photograph and text are mixed. As shown in FIG. 2, this device 70 includes a sub-exposure lamp 41a for linearly irradiating a surface 43a of the lower surface 43 of the exposure table ↓9 in the longitudinal direction of the exposure table 19, and a sub-exposure lamp 41a for linearly irradiating the surface 43b of the lower surface 43 of the exposure table ↓9. A sub-exposure lamp 41b for irradiating, a sub-exposure lamp 41c for similarly irradiating the surface 43c, and each of these lamps 4.1a,
Optical fibers 42a, 42b for guiding the emitted light from 41b, 41c to the irradiated surface of the microcapsule paper 37 that is in close contact with the lower surface 43 of the exposure table.

42c.

The operation of the copying machine 40 configured as above will be explained below. Now, after opening the document platen cover 1 and placing the original on the document glass 2, if you press the start button (not shown), the document platen glass 2 will first move to the right in FIG. The base glass 2 stops at a position where the left end faces the light source. Thereafter, with the halogen lamp 3 turned on, the document table glass 2 is moved to the left.

The light emitted from the halogen lamp 3 is reflected by the original, and then passes through the filter 8, the lens 9, and the two reflecting mirrors 11.
After being reflected, an image is formed on the microcapsule paper 37 located below the exposure table 19.

At this time, the microcapsule paper 37 is placed on the document table glass 2.
The image on the document is formed as a latent image on the microcapsule paper 37 because the microcapsule paper 37 is moved leftward on the exposure table 19 at the same speed as the movement speed of the microcapsule paper 37 .

As the document platen glass 2 moves to the left, the developer paper 38 is taken out from the developer paper cassette 32 by the half-moon roller 33, and is supplied to the pressure developing device 20 in a state where it is overlapped with the microcapsule paper 37 in the exposure section. The latent image on the microcapsule paper 37 is developed and transferred onto the developer paper 38. Thereafter, the developing paper 38 is thermally fixed by the thermal fixing device 50 and then discharged to the paper discharge tray 27 . On the other hand, the microcapsule paper 37 that has passed through the pressure developing device 20
are sequentially wound around the winding shaft 25. Original table glass 2
When the right end of the document has been moved to a position facing the light source, copying of the original is completed and the halogen lamp 3 is turned off.

The sensitivity of the microcapsule paper 37 is as shown in FIG. However, in the case of continuous tone originals such as photographs, sub-exposure is performed on the microcapsule paper 37 with exposure energy A, and the light reflected from the white part of the original is exposed with exposure energy B. It is well known that the main exposure should be carried out so that . Therefore, in the case of a document 500 having a photographic area 100 and a text area 200 as shown in FIG. 3, the upper photographic area 100 is
, 41c are all turned on to irradiate the surfaces 43a, 43b, 43c, and main exposure is performed.
are sub-exposure lamps 41 a, 41 b, 41 c
All lights are turned off and only the main exposure is performed. In the case of a document 600 that has a photo section 300 in the upper left part and a text section 400 in the other parts as shown in FIG. 4, the sub-exposure lamp 41. Light c halfway to illuminate surface 43c,
The main exposure is performed with the lamps 41a and 41b turned off, and when the photographic section 300 is finished being exposed, the sub-exposure lamps 41a and 41b are turned off.
, 41c are all turned off and only the main exposure is performed to obtain a clear image. Although this embodiment has only three sub-exposure lamps 41a, 41b and 41c, it may be divided into more lamps.

Note that the same reference numerals in each figure indicate the same or corresponding parts.

〔Effect of the invention〕

As is clear from the detailed explanation above, according to the present invention, even if the original has an image with gradation, sub-exposure can be applied to a designated part of the exposure area according to the gradation, so that etc. will result in an image with gradation, while the text portion will be an image with no gradation and the edges of the characters will be clear, making it possible to form a beautiful image close to the original.

[Brief explanation of the drawing]

Figures 1 to 5 are diagrams showing one embodiment of the present invention.
The figure is a sectional view of an image recording device, FIG. 2 is a perspective view showing a sub-exposure irradiation device according to the present invention, FIGS. Figure 5 is a graph showing the sensitivity curve of microcapsule paper. 37... Photosensitive pressure sensitive paper (microcapsule paper), 38.
...Developer paper, 70...Sub-exposure irradiation device, 500.600...Original.

Claims (1)

[Claims] In an image recording device, an image is formed by exposing a light-sensitive and pressure-sensitive paper in an exposure section to form a latent image, and then superimposing the light-sensitive and pressure-sensitive paper on a developer paper and developing it under pressure to form an image. An image recording apparatus comprising a sub-exposure irradiation device capable of irradiating sub-exposure to a designated portion of the exposure section.