JPH0196635A - Image forming method - Google Patents

Abstract

PURPOSE:To prevent the coloring in a non-image area by exposing the non- image area with an LED whose wavelength is within a range where at least two kinds of spectral sensitivities are overlapped. CONSTITUTION:A photosensitive material is exposed in terms of image so as to form an image on a position 32 between the sensitive nip rollers 28 and 30 on an exposure sensitive material supporting roller 26. LED arrays 3 and 4 are arranged before and behind the image exposing position 32 and the non- image areas of the photosensitive material are respectively exposed on the positions 32a, and 32b in case of variable magnification or at the time of specifying an image area. And the LED arrays 3 and 4 project the light of the wavelength in which two kinds of spectral sensitivities of the photosensitive material are overlapped by the application of a current. Thus, the coloring in the non- image area can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming method in which a color image is formed by subjecting a photosensitive material having spectral sensitivities to three types of wavelengths to imagewise exposure.

[Conventional technology]

As an image recording method, the patent application filed in 1983 by the present applicant
There is one disclosed in the specification of No. 0-121284. In this image recording method, a photosensitive material is first imagewise exposed to form a latent image, then developed by heating, and a polymerizable compound in the area where the latent image exists is polymerized to produce a polymer compound. to harden the microcapsules. Then, the material is overlapped with an image-receiving material having an image-receiving layer to which the color image-forming substance can be transferred, and pressure is applied to rupture at least a portion of the microcapsules in areas where no latent image exists, thereby transferring the color image-forming substance to the image-receiving material. to obtain an image on an image-receiving material.

[Problem that the invention seeks to solve]

When a manuscript is copied at the same size or in reduced size using the image recording method described above or the color copying method of silver halide photography,
Since the edges of the document are recorded as black lines, a light source different from the image exposure lamp irradiates the edges of the document with white light to prevent the edges of the document from being recorded.

Furthermore, when recording is performed by specifying an image area, color development in the non-image area is prevented by exposing the non-image area to white light.

However, in order to perform the above-mentioned white exposure, high precision is required for exposure position control.
Three-color LF and D arrays that emit light with wavelengths of nm are incorporated into the image recording apparatus, which poses problems in that the configuration becomes complicated and the operation becomes larger.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems, and to provide an image forming method that exposes a non-image area with a simple configuration without performing white exposure and prevents color development in the non-image area. .

[Means and effects for solving the problems] The above object of the present invention is to provide an image forming method in which a color image is formed by performing imagewise exposure on a photosensitive material having spectral sensitivities to three types of wavelengths. This is achieved by an image forming method characterized in that a non-image area is exposed to light by an LED having a wavelength in a region where the spectral sensitivities of the two overlap.

That is, by using at least two types of LEDs having wavelengths in a region where their spectral sensitivities overlap, one type or two types of LEDs may be used, the configuration of the image forming apparatus can be reduced to N, and the size of the apparatus can be reduced.

In the present invention, the photosensitive material refers to a general silver salt photographic material including a material for obtaining a visible image by applying pressure to a latent image generated by imagewise exposure.

Further, the present invention can be applied to both a system in which the exposed portion is polymerized and hardened, and a system in which the exposed portion is depolymerized and softened.

An example of such a material is a type of material in which a polymerizable compound is imagewise cured by imagewise exposure, and then a visible image is obtained by applying pressure, as disclosed in Japanese Patent Application Laid-Open No. 57-1991 filed by the present applicant. The material disclosed in Japanese Patent No. 179836 is mentioned. This material has a synthetic polymer resin wall capsule containing a vinyl compound, a photopolymerization initiator, and a colorant precursor supported on a support.

In addition, hot holes (
The patent application filed by the present applicant is of the type in which the silver halide is developed by developing the silver halide, the polymerizable compound is simultaneously cured in response to this development, and then pressure is applied to obtain a visible image. The material disclosed in Japanese Patent Application No. 60-121284 is one in which a color image-forming substance is transferred to an image-receiving material having an image-receiving layer after thermal development. A support 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 coated on the support. The image forming substance is encapsulated in the same microcapsule.

[Embodiment]

Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a sectional view of an image recording apparatus that implements the method of the present invention.

The image recording apparatus includes a document supporting glass plate 2 mounted on the upper surface of a housing 1 so as to be slidable back and forth in the direction of arrow A. That is, the original is placed face down on the glass plate 2, and the arrow A
Move back and forth in the direction.

At the bottom of the glass plate 2, there is a reflecting mirror 6 for illuminating the original.
An additional illumination lamp 8 is provided, and a fiber lens array 10 for forming an original image on a photosensitive material S at a predetermined position is provided.

A photosensitive material magazine 14 containing a photosensitive material roll 12 wound with a photosensitive material S is removably attached to the side of the housing 1. At the outlet 16 of the photosensitive material S of the photosensitive material magazine 14, a pair of photosensitive material feeding rollers 21 and 22 housed in the magazine connection dark box 20 are arranged, whereby the photosensitive material S wound around the photosensitive material roll 12 is moved to a predetermined position. Sometimes it is extended out a certain length and then retracted if desired.

When the leading edge of the photosensitive material S advances, the photosensitive material feeding rollers 21 and 22 move away from each other as shown by imaginary lines to facilitate the advance of the photosensitive material S. A photosensitive material S is placed in front of the magazine connection dark box 20 (hereinafter, "front" refers to the downstream side in the direction of travel of the photosensitive material, etc.).
A cutter unit 23 for cutting the material and a guide manual pressure 24 are arranged.

In front of the guide plate 24, an exposed photosensitive material support roller 26 and two photosensitive material nip rollers 28 and 30 that are pressed against the exposed photosensitive material support roller 26 are arranged. The photosensitive material S guided by the guide plate 24 is brought into close contact with the exposed photosensitive material support roller 26 by the photosensitive material nip rollers 28 and 30, and
Imagewise exposure of the document is made by the fiber lens array 10 at a position 32 between 8.30 and 30.

In front of the exposed photosensitive material support roller 26, a heat developing device 4o that heats and develops the exposed Pomaru material S is arranged. The heat developing device 40 includes a developing housing 41 having a heat insulating effect, and a developing housing 41 disposed within the developing housing 41 for storing a photosensitive material S.
A transport drum 42 that carries and transports
It has a heating plate 43 which is pressed by a spring 48 on the outer periphery of an arc of approximately 2400 degrees, and the photosensitive material S is transferred to the conveying drum 4.
The heat developing device 40 performs heat development while conveying the photosensitive material S by holding it between the photosensitive material S and the heating plate 43. It has a peeling claw 47 that peels off the paper from the conveyance drum 42 and guides it to the contact portion of the conveyance roller 46.

In front of the conveyance roller 46, a pair of pressure rollers 6°,
A guide member 61 guides the photosensitive material S conveyed by the conveyance roller 46 to the contact portion of the pressure roller 60, and the image receiving paper C conveyed by the conveyance roller 62 supplied by the light receiving paper supply device 72 is transferred to the pressure roller 6o. A photosensitive image receiving paper stacking device 7o is disposed, which includes a guide member 63 that guides the paper to the abutting portion of the paper.

The receiving paper supply device 72 includes a receiving paper cassette 73 that is attached to the side of the housing 1 and stores the receiving paper C, and a feeding roller 74 that supplies the uppermost receiving paper C in the receiving paper cassette 73 to the transport roller 62. It consists of a guide member 75.

A pair of pressure nip rollers 80.82 and a pressure nip roller 80.8 are provided in front of the photosensitive image receiving paper stacking device 7o.
bank up rollers 84 and 86 for making the pressure of the photosensitive materials S and N2 uniform in the axial direction; Press the image receiving paper C with the nip roller 80.8
2 and guides it to the guide member 92.
A transfer device 88 consisting of 79 is provided. The pressure nip rollers 80, 82 are pressed together with a pressure of about 500 kg/cd.

A photoreceptor paper peeling device 90 is provided in front of the transfer device 88 . The photosensitive material receiving paper peeling device 90 includes a guide member 92, a feed roller 94, and a guide roller 98 so as to press only the photosensitive material S at the outer end portion on the feed roller 94.
．． 100 and a peeling belt 102 wrapped around it.

A sensitive material disposal section 104 is provided below one side of the peeling device 90, and a fixing device 106 is provided in front.

The photosensitive material disposal unit 104 consists of a guide member 10B, a pair of feed rollers 110, 112, and a waste box 114, and the photosensitive material S sent from the peeling device 90 and guided by the guide member 108 is sent to the feed rollers 11G, 11.
2, it is thrown into the waste box 114.

The fixing device 106 includes a guide member 120 and a reflective member 12.
It consists of an ultraviolet irradiation lamp 124 with two attachments and a pair of feed rollers 126 and 128, and the image receiving paper C sent from the peeling device 90 and guided by the guide member 120 is irradiated with ultraviolet light for about 5 seconds to fix it. conduct.

A take-out tray 130 for receiving the image receiving paper C is attached to the front of the fixing device 106 so as to protrude from the housing 1 .

FIG. 2 is a block diagram of the exposure section, showing a configuration for exposing a non-image area. Note that the photosensitive material S has a spectral sensitivity as shown in FIG.

The photosensitive material S is imagewise exposed on the exposed photosensitive material support roller 26 at a position 32 between the photosensitive material nip rollers 28 and 30 to form an image. LED arrays 3.4 are arranged in front and behind the image exposure position 1i32, and the non-image areas of the photosensitive material S are set at positions 32a, 32 when changing magnification or specifying an image area.
b, respectively.

The LED array 3.4 emits light having wavelengths overlapping the spectral sensitivities of two types of the photosensitive material S by energizing the LED array 3.4.
The D array 3 emits light with a wavelength of 550 nm, and the second L array 3 emits light with a wavelength of 550 nm.
The ED array 4 emits light with a wavelength of 660n-. Since the photosensitive material S has a spectral sensitivity as shown in FIG.
The capsules that produce magenta and cyan colors are cured by light of a wavelength of 660 nm from the LED array 4 . Therefore, the areas exposed by the two LED arrays 3.4 do not develop color, and the areas corresponding to the edges of the original of the photosensitive material S or non-image areas are exposed by the two LED arrays 3.4.
4 can prevent color development in these areas.

Since the photosensitive material S has low sensitivity to the light from the LED array 3.4, it is necessary to increase the amount of exposure.

In order to increase the amount of exposure, for example, the LED array 3.4 may be placed close to the photosensitive material S, or the LED array 3.4 may be placed close to the photosensitive material S.
This can be done by increasing the amount of current supplied in step 4 or by slowing down the photosensitive material conveyance speed.

Further, the two LED arrays 3.4 do not need to be placed before and after the image exposure position 32, but may be placed together either in front of or behind the image exposure position 1132.

FIG. 4 is a block diagram of a modified example of the exposure section, and the photosensitive material S has a spectral sensitivity as shown in FIG.

An LED array 5 is arranged in front of the image exposure position, and this L4D array 5 emits light having a wavelength at which the three types of spectral sensitivities of the photosensitive material S overlap, for example, light having a wavelength of 550 nm. When the photosensitive material S is irradiated with light having a wavelength of 550 nm, the capsules that produce yellow, magenta, and cyan colors are all cured, so that the area exposed by the LED array 5 does not develop any color. Therefore, when changing the magnification or specifying an image area, by exposing the area of the photosensitive material S corresponding to the edge portion of the document or the non-image area using one LED array 5, it is possible to prevent color development in these areas.

Note that the LED array 5 does not need to be placed in front of the image exposure position 32, and may be placed behind it.

〔Effect of the invention〕

According to the present invention, a non-image area is exposed to light using an LED having a wavelength in a region where the spectral sensitivities of the photosensitive materials overlap, and color development in the non-image area is prevented. Only one or two types of LEDs are required, and the image forming apparatus becomes smaller.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the image recording apparatus, FIGS. 2 and 4 are configuration diagrams of an exposure section, and FIGS. 3 and 5 are graphs showing the spectral sensitivity of photosensitive materials. Symbols in the figure: S...Photosensitive material C...Receiving paper 1...Housing 2 Glass plate 3.4.5...LED array 6...Reflector 8...Illumination lamp 10...
・Fiber lens array 12...Sensitive material roll 14...Sensitive material magazine 1
6...Exit 20...Magazine connection dark box 21.22...Sensitive material feeding roller 23...Cutter unit 24...Temporary guide 26...Exposed sensitive material support roller 28.30...Sensitivity Material nip roller 32...Exposure position 40...Heat developing device 4
1... Developing housing 42... Conveyance drum 43.
... Heating plate 44.46 ... Conveyance roller, 4
5...Guide member 47...Peeling claw 48...
Spring 60... Pressure roller 61.63...
- Guide member 62... Conveyance roller 70... Sensitive material image receiving paper stacking device 72... Image receiving paper supply device 73... Image receiving paper cassette 7
4... Feeding roller 75... Guide member 76.
77...Release agent application device 78.79...Peeling claws 80, 82...Pressure nip roller 84.86...Backup roller 88...Transfer device 90...Sensitive material image receiving paper peeling device 92... Guide member 94... Feed roller 98
．． 100...Guide roller 102...Peeling belt 10
4... Sensitive material disposal section 106... Fixing device 108.
...Guide members 110, 112...Feed rollers 114...Disposal box 130...Eject tray

Claims (1)

[Claims] In an image forming method in which a color image is formed by performing imagewise exposure on a photosensitive material having spectral sensitivities to three types of wavelengths, a non-image area is exposed to light using an LED having a wavelength in a region where at least two types of spectral sensitivities overlap. Characteristic image forming method.