JPS61109075A - Method and device for electrophotographic recording - Google Patents

Abstract

PURPOSE:To prevent black stripes from being formed at a peripheral during wide-range development from an object area of image recording on an electrophotographic body by irradiating the blank part of an electrophotographic with light limitedly except at the object area of image recording, and discharging the blank part electrostatically. CONSTITUTION:A fiche film 3 is placed on an XY stage 4 and the conductive layer on the fiche film 3 and the XY stage 4 are grounded. Then, an electrostatic charging device 11 charges the entire surface of the fiche film 3 while moved on the top surface of the XY stage 4. Then, the image of an original 6 to be recorded is formed and exposed to the object area A of image recording through an image forming lens 5 to form electrostatic latent images in respective object areas A of image recording and at the same time, light emitted by a light source 7 is cut off partially with a mask 9 for peripheral removal to prevent the light from reaching the object areas A of image recording; and the light is allowed to reach a range B as the peripheral part of the object areas A of image recording, thereby discharging the range B electrostatically and successively. Then, the images are developed by a developing device 12. Thus, undesirable black stripes are prevented from being formed at the periphery of the object areas of image recording.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electrophotographic recording method and apparatus ◇ <Prior Art> Electrophotographic recording involves the use of a photoconductive insulator and a conductor supporting the insulator. An electrophotographic photoreceptor (hereinafter referred to as "electrophotographic photosensitive film") consisting of Creates an electrical latent image corresponding to the pattern,
This electrical latent image is made visible on paper or other materials by various methods.

As a method of charging and exposing a limited area of an electrophotographic film, a system disclosed in Japanese Patent Publication No. 58-22744 and the like is known.

This system is a system that forms micro images by performing charging, exposure, development, drying, and fixing on an arbitrary limited image area.In particular, charging and exposure are performed in the same room,
A compact image forming section is realized by separating the charging area, the exposure area, and other blank areas using a common mask. An exposure lens 2 is disposed at one open end of the nine-charge exposure chamber 1, and a mask 103 is provided at the other open end. An opening 104 is formed in this mask 103 to have the same size as the charging and exposure area. On the other hand, a corona electrode 105 is inserted into the charging exposure chamber 1 via a suitable electrical terminal, and its tip is located at the center of the opening 104 of the mask 103. Therefore, when the corona electrode 105 is discharged, the electrophotographic film 106 that is in close contact with the mask 103 is charged only in an area having the same size as the opening 104. ! Friend, exposure lens 2t
- If the electrophotographic film 10.6 is illuminated through the lens, only the area of the same size as the aperture 104 will be exposed. Due to poor adhesion between the electrophotographic film 103 and the electrophotographic film 106, the charged area C
The exposed area may be narrower compared to the image area, and the charged potential of the mismatched area G between areas C and D is high as shown in Figure 6, etc., so if the development is continued, this mismatched area G will be visible around the image area. Please be careful as this will leave undesirable black streaks. To prevent such black streaks from occurring, see Figure 6 (
As shown in b), it is sufficient to provide a region Ft'' with high reflectance around the image area E and expose it to light, and develop only the image area E in a limited manner so that the mismatched area G is not developed. However, in order to do this, the exposure device becomes larger and a lens with a larger angle of view is required, which increases the cost and also brings about problems such as the development method is limited.

Means for Solving the Problems> The present invention can reliably prevent the occurrence of black streaks around the image area, does not require a Daisho exposure device or a lens with a large angle of view, and is not limited to the developing method. The purpose of this method is to provide an electrophotographic recording method in which the surface of an electrophotographic photoreceptor is charged over a wider area than the image recording area, and then charging is performed from the back side of the electrophotographic photoreceptor. Light is irradiated in a limited manner only to the blank area other than the image recording area to discharge the electrical charges in the blank area, and then the image to be recorded is formed on the image recording area and exposed to form an electrostatic latent image. The electrophotographic recording apparatus of the present invention is characterized in that it includes a charger that charges the surface of the electrophotographic photoreceptor over a wider area than the image recording area, and a charger that charges the surface of the electrophotographic photoreceptor over a wider area than the image recording area; A light source that irradiates light to a blank area other than the recording area, a light shielding means that specifically shields only the image recording area from the light source, and an electrostatic latent image that forms and exposes the image to be recorded on the image recording area. The invention is characterized by comprising an exposure device for forming.

Effect> If the surface of the electrophotographic photoreceptor is charged over a wider area than the image recording area, the margins other than the image recording area will also be charged, but after this, the back side of the electrophotographic photoreceptor will be charged. When light is irradiated in a limited manner to the blank area to be chewed, the charges in the blank area will be discharged. After that, if the image to be recorded is imaged and exposed in the image recording area to form an electrostatic latent image, and then developed over a wider area than the image recording area, the margin area may not be developed because it is not charged. No black streaks or the like will occur.

<Embodiment> FIGS. 1 and 2 show an electrophotographic recording apparatus according to an embodiment of the present invention. In this embodiment, a fish film 3 is used as an example of an electrophotographic film. This fish film 3 is placed on a transparent XY table 4 and is grounded to this XY table 4. As shown in the figure, the XY table 4 is movable in the X and Y directions, and above the XY table 4 is an imaging lens 5.
is arranged, and a document 6 is arranged further above it. The imaging lens 5 is an exposure device that forms an electrostatic latent image by exposing the recorded image of the original 6 onto the surface of the fish film 30, and the area where the electrostatic latent image is formed is the image recording area. It is. The fish film 3 has image recording areas A arranged in several columns and rows, and an XY table 4t-
It is possible to sequentially expose each image recording area A by moving in the X direction or the Y direction. On the other hand, a light source 7 is arranged directly below the imaging lens 5 below the XY table 4, and between the light source 7 and the XY table 4, a condenser lens 89 and a peripheral removal mask 9. A lens 10 is interposed. The light emitted from the light source 7 passes through the condenser lens 8, is partially blocked by the peripheral removal mask 9, and then reaches the artificial surface of the fish film 3 through the lens 10t-m, but the range B that it reaches is Second
As shown in the figure, this is the peripheral part of the image recording area A, and the peripheral removal mask 9 blocks light from reaching the image recording area A'. To the east, Teidenso t11 is placed on the left side of the XY stage 40, and the XY
A developing device 12 is arranged on the right side of the stage 40 in the figure, and the charging device 11 can charge the entire surface of the fish film 3 placed on the XY stage 4 while moving to the upper surface of the XY stage 4. .

The electrophotographic recording apparatus having the above configuration is used as follows. First, the fish film 3 is placed on the XY stage 4, and the conductive layer of the fish film 3 and the
Ground. Next, while moving on the upper surface of the charging device 111XY stage 4, the entire surface of the fish film 3t is charged. After that, images of the document 6 are sequentially exposed to the image recording area A using the imaging lens 5 to form a s t ya image in each image recording area A, and at the same time, light is emitted from the light source 7. The peripheral removal mask 9 partially blocks the light so that it does not reach the image recording area A, and also allows the light to reach a range B at the periphery of the image recording area A, and removes the charged charge t in this range B. -Sequential discharge.

Since the range B of the peripheral portion of the adjacent image recording area A overlaps with each other, if a 1itm image is formed in all the image recording areas AK, no electrical charges will remain in the margin area. After forming electrostatic latent images in all image recording areas A, the fish film 3 is transferred to the developing device 1.
2 and will be developed. Since no electrical charges remain in the margins other than the image recording area A, undesirable black streaks do not occur around the upper area A.

In the above embodiment, the step of forming an electrostatic latent image on the image recording area A and the step of discharging the charged charges in the range B around the area A are performed at the same time. As long as it is between the step and the development step, either step may be performed before the other. Further, in the above embodiment, a peripheral removal mask 9 is arranged as a light shielding means between the light source 7 and the XY stage 10, but the light shielding means is not limited to such a mask, and only the image recording area A is used as the light shielding means. It is sufficient if the light can be shielded from the light source in a limited manner. For example, the second
As in the embodiment, between the fish film 3 and the XY stage 4, there is an area A directly below the image recording area A.
It is preferable to install a mask 13 having the same shape as the one shown in FIG. The liquid crystal may be made so that light cannot pass through it, and in this way, changes in the size of the image recording area A can be easily dealt with by simply changing the area where voltage is applied to the liquid crystal. .

Next, a third embodiment shown in FIG. 4 will be described. The embodiment shown in the figure is applied to a process head that sequentially performs charging, +4 light, development, drying, and fixing processes on a strip-shaped electrophotographic film 14. Chamber 15 is shown. The band It exposure source N15 is equipped with an electrophotographic film 14f: a corona wire 16 for charging, a ground electrode 17, and a lens 18 for forming a recorded image on the electrophotographic film 14 to form an electrostatic latent image. There is. An opening 19 is provided below the charging exposure chamber 15, and an electrophotographic film 14 is inserted into this opening 19.
is held down by a holding plate 20. The presser plate 20 is
A metal vapor deposited film 23 is coated on the entire surface of a transparent body 22 made of glass, acrylic, etc., and a smaller opening 21 is formed directly below the opening 19, and further, a portion around the opening 21 on the surface of the transparent body 220 is formed. A light source 24 is inserted into a transparent body 22 while a metal vapor deposition film is removed from the transparent body 22.

Such a process head is used as follows. first,
The corona wire 16 is discharged to charge the electrophotographic film 14. The charged area is an area corresponding to the opening 19 which is wider than the image recording area A. Thereafter, the lens 18 forms and exposes the image to be recorded onto the image recording area A to form a static IM and latent*. At the same time, when the light source 24 is turned on, the light propagates within the transparent body 22, is reflected by the metal vapor deposited film 23, and is emitted from the peripheral portion of the opening 21.
It reaches the back side of the photographic film 14. The range B that the light reaches from the artificial surface is the peripheral part of the image recording area A, but it slightly overlaps with the area A. When the light reaches the area B, the electrical charges are discharged, and the electrophotographic film 14 then proceeds to the developing process.

In the developing process, since no electrical charge remains in the peripheral portion of the image recording area A, undesirable black streaks will not occur.

In this embodiment, since the image recording area A and the range B to which light is irradiated partially overlap, even if the positioning accuracy of the presser plate 20 with respect to the charging exposure chamber 15 is somewhat poor, the area A and the range B There is no gap between the two, and the occurrence of black streaks can be reliably prevented in the developing process.

Furthermore, since the metal vapor deposited film 23 serving as a light shielding means and the light source 24 are integrated into the holding plate 20, the entire device becomes extremely compact.

<Effects of the Invention> As described above in detail, in the present invention, light is irradiated in a limited manner to the blank area other than the image recording area of the electrophotographic photoreceptor to discharge the electrical charges in the blank area. Therefore, the developing method is not limited, and even if the development is performed in a wider area than the image recording area, black streaks will not be generated in the periphery of the image recording area, and the image quality will be improved. Furthermore, since a plurality of image recording areas can be developed simultaneously, the development time can be shortened, and the uniformity of development can also be improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a first embodiment of the electrophotographic recording device of the present invention, FIG. 2 is a sectional view of the main part of the device shown in FIG. 1, and FIG. 3 is a perspective view of the electrophotographic recording device of the present invention. 4 is a sectional view of a third embodiment of the electrophotographic recording apparatus of the present invention, FIGS. 5 and 6 are related to the prior art, and FIG. 6(a) and 6(b) are graphs showing the charging potential of the electrophotographic film, respectively; FIG. 6(a) is before exposure, and FIG. 6(b) is before exposure. Show the rear. In the drawing, 1 is an electrophotographic film, 2 is a mask, 3 is a fish film, 4 is an XY stage, 5 is an imaging lens, 6 is an original, 7 is a light source, 8 is a condenser lens, 9 is a peripheral removal mask, 10 is a lens, 11 is a charging device, 12 is a developing device, A is an image recording area, and B is a range to which light is irradiated. Patent applicant Fuji Photo Film Co., Ltd. Agent Patent attorney Shibe Mitsuishi (and 1 other person) Figure 2 So Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) After charging the surface of the electrophotographic photoreceptor in a wider area than the image recording area, irradiating light from the back side of the electrophotographic photoreceptor in a limited manner to the blank area other than the image recording area, An electrophotographic recording method characterized in that, while discharging the electrical charges in the margin portion, a recorded image is formed and exposed to light in an image recording area to form an electrostatic latent image. (2) a charger that charges the surface of the electrophotographic photoreceptor over a wider area than the image recording area; and a light source that irradiates light from the back side of the electrophotographic photoreceptor to a blank area other than the image recording area; Electrophotography characterized by comprising: a light shielding means for limiting light shielding of the image recording area from the light source; and an exposure device that forms an electrostatic latent image by exposing the recorded image to the image recording area. Recording device.