JPH0241251A - Electrophotographic apparatus - Google Patents

Abstract

PURPOSE:To commonly use a light emitting unit and to make adaptable to a display and an electric elimination by providing an image processor for transferring an image formed by exposing a photosensitive unit and developing it to a sheet and fixing it, and a controller for electrically eliminating the unit by emitting a light on a display unit. CONSTITUTION:When an operator from a document while observing the screen of a CRT 1 and instructs the print of its content by a keyboard 70, a microcomputer 60 carries a sheet in a sheet cassette 10 to a registration roller R, operates in parallel a charger 5, a developing unit 6, a transfer charger 7 and fixes it. Then, a controller 50a emits a light on an electrophotographic exposure section B, exposes it on a photosensitive drum 4, simultaneously emits a light at an eraser A, and starts electric elimination on the drum 4. Then, the roller R so feeds a sheet as to transfer the image on the drum 4 to the sheet, and a document is imaged on the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic apparatus equipped in a device equipped with a raster scan type display device such as a CRT, such as a word processor or a computer.

[Prior art]

An electrophotographic printer is a type of printer installed in devices such as word processors or computers. This image forming process involves exposing an image to be printed onto a charged photoreceptor using an optical head to form a latent image.
This is developed and transferred onto paper, and after this,
In order to prepare for the next image formation, the photoreceptor has residual charges on its surface removed by an eraser lamp or the like.

[Problems to be Solved by the Invention] By the way, in the above-mentioned device, - numerically, CRT
When using an electrophotographic printer, if you consider the display device as one light emitting part, there are two light emitting parts along with the eraser lamp of the electrophotographic printer. It cannot be said to be rational because it is used only for the purpose of doing so.

The present invention has been made with this in mind, and it is an object of the present invention to provide an electrophotographic apparatus that has a common light emitting section and is configured to support both functions.

[Means for Solving the Problems] An electrophotographic apparatus according to the present invention is an electrophotographic apparatus that uses a part of the screen of a raster scan type display device as an erase light source, and includes a photoreceptor. an image processing section that transfers and fixes an image developed and formed by exposure to light onto paper, and an optical system that makes its entrance side face a part of the screen of the display device and its exit side face the photoreceptor, respectively. ,
The image processing apparatus is characterized by comprising a control section that causes the display device to emit light to eliminate static electricity from the photoreceptor of the image processing section.

[Effect]

The optical system has an incident side that connects to a part of the screen of the display device.
Further, the emission side faces each of the photoreceptors of the image processing section, and the photoreceptors are neutralized by the control section emitting light from the display device.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof. FIG. 1 shows an electrophotographic apparatus (hereinafter referred to as
FIG. 2 is a schematic cross-sectional view of a device of the present invention. desk 1
The device of the present invention placed on the top of the CRT 1 has a CRT 1 as a raster scan type display device, and an image processing device 100 is installed below it in the same case. The screen of the CRT 1 is used not only as an erase light source but also as an exposure device. The image processing device 10Q includes a photosensitive drum 4, and above the photosensitive drum 4, a plurality of convergent rod lenses are aligned and extended in the main scanning direction of the screen of the CRT 1 with a length approximately equal to the width in the main scanning direction. Tenaru Lens Array 3
is arranged in front of the lower end of the screen of the CRT 1, and its mirror surface is used to reflect downward the image of part B (electrophotographic exposure part) that spans the entire width of the lower end of the screen in the main scanning direction. The reflected light image is focused onto the surface of the photoreceptor drum 4 via the lens array 3 by a mirror 2 which is arranged diagonally downward and has a length substantially equal to the width in the main scanning direction of the CRTl, that is, it is exposed. It's like letting them do it. Said CRT
Usually, the mirror 2 is often used with a spherical screen, so the shape of the mirror 2 should be curved to match that, or the incident path and focal length of the lens array 3 should be adjusted accordingly. By using a lens that changes according to the spherical state of the screen in the main scanning direction, the light is focused on the photosensitive drum 4 in a straight line without distorting the image (dot row) in the main scanning direction. (.

The photosensitive drum 4 is driven to rotate in the direction of arrow a, and the charger 5 is placed at a position upstream in the direction of rotation of the drum from the part where the light condenses from the lens array 3, and at a position also downstream in the direction of rotation. A developing device 6 is disposed at each of the two. The charger 5 applies a constant electric charge to the surface of the photoreceptor drum 4, and an electrostatic latent image corresponding to the image of the electrophotographic exposure section B exposed by the mirror 2 and the lens array 3 is formed on the surface of the photoreceptor drum 4. It is formed. The developing device 6 visualizes this electrostatic latent image into a toner image.

A transfer charger 7 is provided below the photoreceptor drum 4, and the transfer charger 7 is loaded into a paper cassette 10 between this and the photoreceptor drum 4, and is sent out by a paper feed roller 11 and a registration roller R. An electric field is applied from the bottom surface of the paper to transfer the toner image onto the paper.

A cleaning device 8 is provided at a position on the downstream side of the transfer charger 7 in the rotation direction of the photoreceptor drum 4, and the cleaning device 8 uses a blade method to remove toner remaining on the surface of the photoreceptor drum 4.

At a position on the photoreceptor drum 4 facing between the cleaning device 8 and the charger 5, there is an appropriate length in the main scanning direction, that is, the length of the photoreceptor drum 4, slightly above the electrophotographic exposure section B of the CRT l. The optical system is configured to guide an image of a portion A (eraser portion) having a width approximately equal to The light image of the eraser section A is reflected and illuminated onto the photoreceptor drum 4, thereby removing the charge remaining on the surface of the photoreceptor drum 4. Note that the shape of this mirror 9 is also made to correspond to the surface shape of the CRT 1, similarly to the mirror 2.

The paper to which the toner image has been transferred by the transfer charger 7 is
The toner image is sent to the fixing roller 12, where the toner image is melted and fixed by heat, and then discharged to the front side from the paper discharge port.

A keyboard 70 for inputting information is placed above the housing portion of the fixing roller 12.

FIG. 2 is a block diagram showing the configuration of the control system of the apparatus of the present invention. The keyboard 70 is a microcomputer 60
The microcomputer 60 is connected to a CRT.
It is connected to the CRT 1 via a controller 50a for controlling the image display of the CRT 1. The controller 50a selects the CRT 1 based on the data outputted by the microcomputer 60, for example, the character code if it is a character.
Generates character patterns as video signals to be displayed as actual characters on the screen. The CRT l receives this and displays the characters on the screen.

When the controller 50a uses the CRT 1 only for display, the controller 50a uses the portion of the screen of the CRT 1 above the eraser section A to display characters.

On the other hand, when printing is also performed using the CRT 1, the controller 50a transfers characters for the display screen onto a predetermined number of lines (or only one line may be sufficient) in the electrophotographic exposure section B of the screen of the CRT 1 on the photoreceptor drum 4. The display is scrolled from the bottom to the top of the screen at a predetermined speed synchronized with the rotational speed of the eraser section A, and a predetermined number of lines in the eraser section A are made to emit light.

Here, the characters to be displayed in the electrophotographic exposure section B are mirror characters that are mirror-inverted, and are scrolled from the top of the characters at the beginning of the sentence. Of course, instead of displaying characters by mirror inversion, an additional mirror may be added to the exposure path.The output signal of the microcomputer 60 is also given to the image processing device 100, and the above-mentioned printing can be performed. At the same time, a signal is sent to control the image forming operation.

Next, the operating procedure and operation of the apparatus of the present invention configured as described above will be explained. First, the operator creates a document while looking at the CRTl screen. When a document is completed and a command is given to start printing using the keyboard 70, the microcomputer 60 first transports the paper in the paper cassette 10 to the registration rollers R, and then stops the paper. In parallel with this operation, the charging charger 5, the developing device 6, and the transfer charger 7 are operated. Note that the temperature of the fixing roller 12 is sufficiently high at this point, and good fixing can be performed. Next, the controller 50a sequentially causes the electrophotographic exposure section B of the CRT to emit video signals, and at the same time as the photoreceptor drum 4 is exposed, the eraser section A is caused to emit light, thereby starting static elimination at a predetermined position on the photoreceptor drum 4. . Thereafter, the registration roller R is synchronized with the image on the photoreceptor drum 4 so that the image on the photoreceptor drum 4 is transferred to a predetermined position on the paper.
feeds the paper. This creates an image of the document on the paper.

FIG. 3 is a block diagram showing another embodiment of the control system of the apparatus of the present invention. This embodiment uses a device that does not have a printing function, that is, a keyboard 70. microcomputer 60
．． This figure shows a configuration in which a circuit having a printing function (indicated by the dot-dashed line in the figure) using the CRT 1 according to the present invention is additionally provided to an apparatus configured to include a controller 50a and a CRT 1. In a basic configuration without a printing function, a controller 50a and a CR that generate a video signal according to an output signal from the microcomputer 60 are used.
However, when adding a print function, the controller 50b provided to control the display system and image processing system of the CRT 1 is connected to the controller 50a, and the controller 50b and the CRT 1 are connected directly. 1 and a microcomputer 60 is also connected to the controller 50b. The controller 50b is connected to a VRAM 40 having a storage area corresponding to the screen of the CRT 1 on a one-to-one basis, and stores data according to the output signal of the microcomputer 60 in a VRAM 40.
It is written to the RAM 40 and read when performing screen display and printing on the CRT 1.

The controller 50b is configured to provide a control signal to the image processing device 100.

Now, first, when only display is performed on the CRT I, a video signal generated by the controller 50a is simply sent to the CRT 1 via the controller 50b, and characters are displayed.

On the other hand, when printing is performed using the CRT 1, the controller 50b is used, and the controller 50b saves the image data of the screen to be printed by removing (parts) corresponding to the eraser section A and the electrophotographic exposure section B of the VRAM 40. Also, data for scrolling display on the electrophotographic exposure section B of the CRT 1 is sequentially written into a portion of the VRAM 40 corresponding to the electrophotographic exposure section B.

Then, the controller 50b successively outputs this write data and displays it on the screen of the CRT I, and also causes the eraser section A to emit light. As a result, the operations of the image processing apparatus 100 are performed simultaneously in the same manner as described above, and an image is formed on the paper.

Note that although the above-described display control is performed without using the controller 50a, the controller 50a may be used instead.
The screen to be printed using the video signal of a is dpr.
1 except for the electrophotographic exposure section B, and data on the same screen is stored in the VRAM 40 by the controller 50b.
It may also be configured such that the data is written to the screen, and the data is sequentially read out from the top of the screen and displayed on the electrophotographic exposure section B.

Note that the present invention is not limited to a configuration in which the display scanning screen is also used as an exposure device, but in the case of such a configuration, optical head equipment such as an LED head can be omitted, which further reduces costs. can be achieved.

Furthermore, in this embodiment, the image processing device and the display device are configured integrally, but instead of this, the image processing device may be configured to be detachable so that it can be attached to the display device only during printing. .

〔effect〕

As described above, in the electrophotographic apparatus according to the present invention, since a part of the screen of the display device installed in a device such as a word processor or computer is used as an erase light source, the display device can also be effectively used for printing. The present invention has excellent effects, such as making it possible to omit an eraser lamp in an electrophotographic printer and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of an electrophotographic apparatus according to the present invention;
FIGS. 2 and 3 are block diagrams of the control system. ■...CRT2.9...Mirror 3...Lens array 4...Photosensitive drum 50a, 50b...
Controller 100... Image processing device patent Applicant Minolta Camera Co., Ltd. Agent Patent attorney Noboru Kawano 1 Figure 0a Figure

Claims (1)

[Scope of Claims] 1. An electrophotographic device that uses a part of the screen of a raster scan type display device as an erase light source, which is equipped with a photoreceptor and is capable of developing and forming an image by exposing the photoreceptor to light. an image processing unit that transfers and fixes images onto paper; an optical system that makes its entrance side face a part of the screen of the display device; and its output side face the photoreceptor; and neutralization of the photoreceptor of the image processing unit. An electrophotographic apparatus, comprising: a control section that causes the display device to emit light.