JPS5987444A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To make it possible to form an additional picture not included in the picture of an original on a part of a copied picture or change a part of the original picture on the copied picture by exposing a part of a photoreceptor directly in an electrophotographic device copying the original picture on normal picture by using Carson process. CONSTITUTION:A light shuttering member 31 to be controlled by a shutter controlling circuit 35 is fitted to an optical axis of an optical fiber 22 and acted as a masking means. During the 1st exposure, the inside of a square ACBD is controlled at its operation by the shutter controlling device 35 so that the optical transmittivity of the light shuttering member 31 becomes zero to suppress the 1st exposure, and outside the square ACBD, an electrostatic latent image corresponding to a picture on an original surface 18 is formed. A light emitting diode 32 is turned on and off at the 2nd exposure position in accordance with the input information of a controlling part 34 to form a required picture additionally in the square ACBD.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to an electrophotographic device that copies an image of a document surface onto plain paper using the so-called Carlson process, and more specifically, by directly exposing a portion of a photoreceptor to light. The present invention relates to an electrophotographic apparatus that can form an additional image that is not present on the original surface image in a part of a copied image, or can change a part of the original surface image in the copied image.

1. Construction of a conventional example and its problems FIG. 1 shows a schematic construction of a conventional electrophotographic apparatus using the Carlson process. In FIG. 1, photoreceptor 1
0 rotates in the direction of arrow 12 during copying, and a uniform charge of -7J 1 is applied to the surface by the corona discharge V from the charger 14.

The document surface 18 of the document 16 is illuminated by a fluorescent lamp 2 as document irradiation means.
The photoreceptor 10 is irradiated with light through an imaging optical system such as an optical fiber 22 having a lens effect.
The reflected image is formed on the photoreceptor 10, and the original image is sequentially exposed on the photoreceptor 10 from the right end to the left end of the original surface 18 in synchronization with the rotation of the photoreceptor 10. In the developing device 24, toner sticks to the photoreceptor 10 according to the charge distribution of the electrostatic latent image generated on the photoreceptor 10 by exposing the original surface image, and a developed image is formed on the photoreceptor 10. This developed image is transferred onto the plain paper 11 by the transfer charger 25 to create a copy image.
It is needless to say that the copy image formed as described above has a one-to-one correspondence with the original image.

On the other hand, when copying an image of a manuscript, basically it is based on the image of the manuscript surface, and the part V (in other words, the date of copying, the manuscript title, or the page number on copy paper for multiple manuscripts). If you are able to add a new copy image, such as an image, or correct, change, or delete an image that has already been written on the L'! It is possible to obtain effects such as eliminating the need for correction, and it is of great value as a new additional function to electrophotographic devices. However, in the conventional electrophotographic devices mentioned above, The copied image could not be tampered with, and even in the worst case, the entire image of the original surface was simply mapped as a duplicated image.

OBJECTS OF THE INVENTION The present invention improves such conventional examples, and directly exposes a portion of the photoreceptor of an electrophotographic device to form an additional image that is not on the original surface image on a portion of the copied image, or forms a portion of the copied image. The object of the present invention is to provide an electrophotographic apparatus that can change a portion of an image of a document surface.

Structure of the Invention The electrophotographic apparatus of the present invention, when forming and exposing an image of the surface of a document to be copied on a photoreceptor, masks at least a portion of the image of the surface of the document to be copied onto the photoreceptor. A masking means for creating an unexposed portion of the surface image is provided, and a photoreceptor irradiation means is provided for irradiating the unexposed portion with light, and the photoreceptor irradiation means divides the photoreceptor into a plurality of pixel areas, By directly exposing the photoreceptor for each of the plurality of pixels, a desired exposure pattern can be formed on the photoreceptor portion of the mask.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view showing essential parts of an embodiment of the electrophotographic apparatus of the present invention. In FIG. 2, when copying, the photoreceptor 10 rotates in the direction of arrow 12, and the photoreceptor 10 rotates in the direction of arrow 12.
A charger 14 is placed around 0. It consists of a fluorescent lamp 20 as an original irradiation means for irradiating the original surface 18 of the original 16 placed on the original placing surface 28 of the original table 26, and an optical fiber 22 having a lens effect as an imaging optical system. 1st
Exposure means are provided. The document table 26 is the photoreceptor 1
The image of the original is placed on the original placing surface 28 in sequence from the right end to the left end of the original surface 18 and is exposed to the first exposure on the photoreceptor 10 in synchronization with the rotation of the original. I'm going to leave. Similar to conventional electrophotographic devices, the photoreceptor 10''
An electrostatic latent image is formed by exposing the image on the document surface, and a toner +J is deposited on the photoreceptor 10 by the developing device 24 according to the charge distribution of the electrostatic latent image. A visible image is formed, and in this embodiment, an optical fiber member 31 is installed on the optical axis of the optical fiber 22, which is controlled by the shutter control circuit 3. It functions as a masking means for masking at least a portion of the first exposure of the document surface image performed through the optical fiber 22. As the light transmitter member 31, in addition to a mechanical shutter member, it is possible to use a piezoelectric element or a liquid crystal to electrically change the light transmittance. Indeed, between the fluorescent lamp 2o as the document irradiation means and the developing device 24,
A large number of light emitting diodes 32 are provided 7 as photoconductor irradiation means for second exposure to directly irradiate the photoconductor 10 with light.
'1. ing. The amount of light emitted from the light emitting diode 32 can be arbitrarily set by the amount of current flowing through the light emitting diode 32. It is connected to a light emitting diode 32.

The light emitting diodes 31 and the light emitting diodes 32 are arranged in an array along the width direction of the photoreceptor 10, and a plurality of light emitting diodes 32 are arranged along the width direction of the photoreceptor 10. By configuring it to be divided into pixel areas,
The first exposure to any part of the photoreceptor 10 can be masked, or the second exposure can be performed using the light emitting diode 32.

FIG. 3 is a plan view showing an example in which the image on the document surface 18 is masked by the optical scanner member 31 during the first exposure onto the photoreceptor 10, and shows the document end point 40 and the X-axis, Y-axis, and Y-axis in FIG.
The axes are the original end points 40 and xt4qll in Figure 3, respectively.
, corresponds to YIIQIl. In FIGS. 2 and 3, the document surface 18 is Y! with the end point 4o as the starting point! Since one exposure is carried out sequentially along 1IlII, as shown in Fig. 3, point A
(X+, Yl), C (X2. Yl), B (X
2. Y2).

When masking a quadruple rectangular ACBD with D (X+, Y2), the first exposed part is Y-Y on the Y axis.
When the photoreceptor 100 is at the position 1, the light transmittance of the light transmittance member 31 corresponding to the area between X = X1 and X = The Nyanotar control circuit 35 is operated. The first exposure progresses sequentially along the Y axis, and the Hikari Nyanota member 31 is held in the above state with the ox at the position where Y=Y2, and the Y
After the position=Y2, the light transmittance of the full-light beam 31 is maximized, and the first exposure is performed over the entire width of the document surface 18. In constructing the structure as described above, the first exposure is not performed inside the binary printing form AGBD, and the electrostatic charge added (=j) to the photoreceptor 10 by the charger 14 does not disappear. On the other hand, an electrostatic a image corresponding to the image on the document surface 18 is formed outside the rectangle ACBD.Next, a process for additionally forming a required image within the rectangle ACBD;
Necessary character information etc. are input using the keyboard 42 etc. provided in the control unit 34, and according to this input information, the point where Y=Y+ of the rectangle ACBD is located at the light emitting diode 32.
This is realized by blinking the light emitting diode 32 within the section XlX2 from the time when the second exposure position is reached to the time when the point Y=Y2 is reached.

At this time, it is of course possible to selectively erase the document surface image within the rectangular ACBD by causing the light emitting diodes 32 within the above section to emit light from the entire surface with a sufficiently large exposure amount. If a selection section is provided for selecting and instructing the operation mode of the light emitting diode M 32, that is, the mode of the image to be added, the range of additional functions can be further expanded. In the embodiment shown in FIG. 2, the first exposure of the document surface image is masked by attaching the optical fiber 22 to the lower end surface of the optical fiber 22. Kozuki 20 and manuscript surface 18
Of course, there is no problem even if V (== is provided), or even if the document surface 18 is directly masked to prevent reflection of the irradiated light, the effect of the present invention will not be impaired.

FIG. 4 is a front view of main parts showing another embodiment of the electrophotographic apparatus of the present invention. In the actual Ni example shown in FIG. 2 mentioned above, a light emitting dion (which itself emits light) is used as the photoreceptor irradiation means, and the second exposure amount is changed by blinking the light emission or adjusting the number of light emissions. On the other hand, in the fourth and first embodiment, a fluorescent lamp 44 is used as a light source for irradiating the photoconductor, and this fluorescent lamp 44 is a light source that controls the amount of light irradiating the photoconductor 10. The photoreceptor member 46 is provided in an array along the width direction of the photoreceptor 10. As the light shutter part layer 46, the same material as the /ζth light shader member 31 for masking the first exposure can be used. However, in this embodiment, the fluorescent lamp 44 as a light emitting body and the light shutter part layer 46 are separated, thereby making it possible to improve the small size of the previous embodiment. In addition to making it possible to increase the amount of light emitted from the light emitter compared to when using a single light emitting diode, the size of one shutter element in one layer of the optical shank can be increased, especially when piezoelectric elements or liquid crystals are used. can be made smaller than the size of the light emitting diode. Furthermore, since the switching time of the optical soter can be shortened, when dividing the photoreceptor surface into multiple pixels as described above, it is possible to divide the photoreceptor surface into smaller pixels, and each smaller pixel can have a higher resolution. This has the effect of making it possible to perform the second exposure adjustment. Furthermore, since the fluorescent lamp 44 as the light source for irradiating the photoconductor described above is basically the same as the fluorescent lamp 20 as the document irradiation means, It is also possible to use the fluorescent lamp 2o together and omit the fluorescent lamp 44.

Of course, it is also possible to copy the entire document surface image by not performing the masking operation of the first exposure of the optical gloss printer 31 as the above-mentioned masking means. Part) 1', a detection means for detecting the operating state of A31 is provided, and when it is detected that the light shutter member 31 cannot be operated, the second exposure by the photoreceptor irradiation means is also stopped. By interlocking with the control unit 34 so as not to operate, the operation during full-page copying can be simplified and made even more convenient. Figure 5 shows an optical shutter member cut along a plane parallel to the light incident direction A.
This is a cross-sectional view showing a substrate in which an electrode 62 for applying an electric field is provided on a transparent ceramic plate 60 such as PLZT, and the front and back sides of the main surface of the substrate through which light passes. A polarizing plate 64 having mutually orthogonal polarizing axes on both sides.
．． 66 has a sandwiched structure. Now, the electrode 62b
When 620 and 620 are grounded and a required potential is applied to 62d, no electric field is applied between electrodes 62b and 62C, so the incident light is blocked by the two polarizing plates, and electrodes 620 and 62d
Since an electric field is applied between them, the incident light is transmitted through the action of the electro-optic ceramic.

Effects of the Invention As described above, the electrophotographic apparatus of the present invention masks at least a portion of the original surface image when forming and exposing the original surface image to be copied onto the photoreceptor, and the original surface image is placed on the photoreceptor. A masking means for creating an unexposed portion of the surface image is provided, and a photoreceptor irradiation means is provided for irradiating the unexposed portion with light, and the photoreceptor irradiation means divides the photoreceptor into a plurality of pixel areas. By configuring the photoreceptor to not be exposed directly to each of these pixels, an additional image that is not present on the original surface image can be formed in a part of the copied image, or an additional image that is not present on the original surface image can be formed in the copied image. It is possible to realize an electrophotographic apparatus having new image forming functions not found in conventional electrophotographic apparatuses, such as the ability to partially change parts.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of main parts showing an example of a conventional electrophotographic apparatus, FIG. 2 is a perspective view of main parts showing an embodiment of the electrophotographic apparatus of the present invention, and FIG. FIG. 4 is a front view of main parts showing another embodiment of the electrophotographic apparatus of the present invention, and FIG. 6 shows an example of the structure of a partial layer of Hikari which can be used in the present invention. It is a sectional view of the main part. 1Q... Photoreceptor, 14... Charger, 16...
...Manuscript, 18 ...Document surface, 20 ...Fluorescent light, 2
2. Old optical eye bar, 24...Developer, 26...Transfer charger, 26...Document stand, 28.
・・Document placement surface, 31 ・・・Optical shutter part, 3
2...Light emitting diode, 34...Control unit, 35...Shutter control circuit, 40...Document end point, 42...Keyboard, 44...Fluorescent lamp, 46
・・Mitsuyasota part profit. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure/X 25 Figure 2 Figure 3 285 Figure 4 μ'-25 Figure 5 2

Claims (5)

[Claims] (1) includes an original irradiation means for irradiating the original surface with light to obtain a reflected image; and an imaging optical system for forming the reflected image of the original surface on a photoreceptor; a first exposure means for exposing the original surface image; a masking means for creating a portion where the first exposure is not performed by the exposure means; and a photoreceptor irradiation means for irradiating the portion of the photoreceptor surface that is masked by the masking means and not subjected to the first exposure. and the second photoreceptor irradiator stage divides the photoreceptor surface into a plurality of pixel areas, performs a second exposure to the photoreceptor for each of the plurality of pixels, and exposes the masked photoreceptor. An electrophotographic apparatus characterized in that it is configured to be able to form a required exposure pattern on a portion. (2) The photoreceptor irradiation means, which is used to irradiate the photoreceptor portion that is masked by the masking means and is not subjected to the first exposure of the original image, has a size that can divide the photoreceptor portion into a plurality of pixel areas. An electrophotographic apparatus 0 according to claim 1, characterized in that it is constituted by a plurality of light emitters. (3) The photoreceptor irradiation means for irradiating light onto the photoreceptor portion that is masked by the masking means and where the first exposure of the document surface image is not performed has a size that allows the photoreceptor portion to be divided into a plurality of pixel areas. a plurality of light shutter members;
The electrophotographic apparatus according to claim 1, further comprising a photoreceptor irradiation light source for applying light to the photoreceptor. (4) The photoreceptor irradiation light source is characterized in that it also uses an original irradiation means for irradiating the surface of the original with light to obtain a reflected image. Device. (5) The masking means for masking at least a portion of the original image to create a portion of the photoreceptor where the first exposure is not performed includes a detection means for detecting the operation, and when the masking means does not perform the masking operation; Claims (1) to (4) are characterized in that the photoreceptor irradiation means is configured not to perform the second exposure.
) The electrophotographic device described in any of the above.