JPS60238823A - Image forming device - Google Patents

Abstract

PURPOSE:To select freely an analog picture and a digital picture by one device, by providing a half mirror in an optical path through which the reflected light obtained by irradiating an original by a light source reaches a photosensitive drum, and dividing and selecting the optical path. CONSTITUTION:An original on an original platen 1 is irradiated by a light source lamp 2 and scanned in the direction as indicated with an arrow A, and its reflected light is led to a lens L through mirrors M1-M3. The light which has formed an image by the lens L travels further straight and reaches a half mirror M0, and a reflected luminous flux L1 forms an analog latent image on a photosensitive drum 5 by a usual method. On the other hand, the light which has traveled straight through the half mirror M0 and reached an unmagnification image sensor 4 is photoelectrically converted, binary-coded based on a prescribed threshold level as a reference, scans a laser light which is not shown in the figure, by a rotary mirror 6, passes through lenses 7, 8 and mirrors M4, M0, and made incident on the photosensitive drum 5 as a dot symbol. In such a way, an analog picture and a digital picture can be selected by one device.

Description

[Detailed description of the invention] (Technical field) Large gl BE L+ jIIIi (11TM skin m &
V u I -rsti 釧+11''  It combines the so-called analog image (image forming function) using photographic techniques and the so-called digital image (image forming function) by arranging and combining many dots as pixels. The present invention relates to an image forming apparatus.

(Prior Art) Conventionally, as methods for recording images, there are image forming apparatuses using the above-mentioned analog method and image forming apparatuses using the above-mentioned digital method.

An electrophotographic device is known as a typical device of the former type. An electrophotographic device creates an electrostatic latent image by forming a light image on a uniformly charged photoreceptor in the dark. This electrostatic latent image is developed with toner, transferred to recording paper, and fixed to obtain recording orientations if and t.It is suitable for office use because of its excellent halftone reproducibility. It is used for black-and-white image recording, which is widely used in

On the other hand, a laser printer is known as an example of the latter. For example, an optical system including a solid-state image sensor photoelectrically converts the image information of a document to obtain a digital image signal, and this digital image signal is used to modulate a laser source to create a writing beam. is scanned onto a photoreceptor to carry electrostatic mI#, and one image of a recording surface is obtained in accordance with the process in electrophotography described above.

This digital image forming apparatus has many advantages. For example, by performing logical operations on the output signals of a solid-state image sensor, it is possible to easily extract chromatic colors in a document, erase or write a desired image part, and it is possible to easily perform operations such as erasing or writing a desired image part. By temporarily storing images, you can record images on multiple sheets of recording paper with a single document reading operation, which is useful for shortening the time for forming nails, saving power, and improving reliability. By being able to transmit images to a 7mm fax machine or printer in a remote location using a communication line, it is possible to achieve functions that cannot be obtained with conventional electrophotographic devices.

For this reason, if an image forming apparatus exists that has both analog and digital bonding functions, the advantages of each of the above can be obtained with a single device. It is useful for streamlining office work.

(Objective) Therefore, an object of the present invention is to provide an image forming apparatus that has both analog image forming function and digital image forming function.

According to the above-mentioned object of the present invention, an imaging optical system related to an analog superimposed image forming function and a digital ii! ii) The imaging optical system related to the image forming function is shared, and the optical path splitting means and the same-magnification imager sensor? An image forming apparatus is provided.

(composition) The configuration of the present invention will be described below based on embodiments.

Embodiment 1 (See Figure 1) This example is an example of a device equipped with only one so-called photoconductor drum with a photoconductor formed on its surface. It takes the form of an attached exposure means for formation.

In the figure, reference numeral 1 indicates a document mounting table made of transparent glass. At the lower left end of this document placing table 1 is a joining lamp 2.
is located integrally with the spear 1 mirror M1. These lightless lamps 21, 1 mirror M1, etc. are guided and moved in the direction of the arrow during exposure scanning of the original. Reference numerals M2, M3, and M2 denote mirror 2 and mirror 3, respectively, which are mounted facing each other on the frame 6 and are integrally moved in the direction of arrow A during exposure scanning of an original. The reference numeral indicates the image forming position, and the image forming apparatus is immovably mounted integrally with the main body of the image forming apparatus. A half mirror MO as an optical path splitting means and a 1x image sensor 4 are fixedly arranged in sequence on an extension line connecting the 3-mirror M3 and the imaging lens L. Here, the same-magnification image processor 4 has a depth dimension in the direction penetrating the paper surface, like the mirrors, exposure lamps, etc., and has a light-receiving area corresponding to the largest original placed on the original placing table 1. ing.

Incidentally, on the extension of the optical path connecting the third mirror M3 and the imaging lens L, and in the direction of reflection by the half mirror MO, there is a distance from the imaging lens L to the same magnification image sensor. The photosensitive drum 5 is arranged.This half mirror MO
The position on the photoreceptor drum 5 where the source is irradiated corresponds to an exposure process section, and in this exposure process section, the laser beam from the optical deflector 6 is also applied to a toroidal lens 7, an fθ lens 8, . The light is irradiated sequentially through the JI4 mirror M4 and the half mirror MQ. As this optical deflector 6, a rotating polygon mirror or a holo scanner is used.

Note that laser light from a laser light source (not shown) is incident on the optical deflector 6. This laser light lasts 1llJ
It is modulated by a digital image signal whose intensity changes, and is scanned when it is emitted from the optical deflector 6.

The optical circuit, laser light source, optical deflector 6, toroidal lens 7, f.theta. ~Constitute aspects.

The area around the photoreceptor drum 5 should be placed in () on the electrophotographic device.
For example, 1μc1, in the exposure process section where the exposure light is irradiated and imaged is placed above the rotational direction of the photoreceptor drum 50. KK is the developing device 9. Recording paper guide member 10. Transfer charger 112 Separation charger 12. Cleaning device 16. Main chargers 14 and the like are sequentially arranged. Here, the main charger 14 is located upstream of the exposure process section in the rotational direction.

Either of the recording sheets of different sizes stored in the recording paper cassette 24 or the recording paper cassette 25 is selected and delivered to the recording paper guide member 10 through the guide member 15 or the registration row 21.
6.

In this example, a dry two-component toner is used in the imager 9.

After the transfer, the recording paper is conveyed on the conveyor belt 17 , fixed by the fixing device 170 , and then conveyed to the tray 18 .

Next, the image forming process will be explained.

When copying a manuscript image (elephant), the manuscript is placed on the manuscript table 1 and covered with a pressure plate 19 from above.

Next, the surface of the document is irradiated by the exposure lamp 2 moving in the direction of arrow A. The reflected light from the original is reflected by a 2.1 mirror M1. which moves in the direction of the arrow VC. After being sequentially reflected by the 2nd mirror M2, the 6th mirror M3, etc., it forms an image and passes through the /Z L, and then branches its path at the half mirror MO, and a part of it passes through the half mirror MO. An image is formed on the same-magnification image sensor 4. Others σ) are partially reflected by the half mirror MO and formed into an image on the photoreceptor drum 5.

When forming an image in an analog manner, exposure is performed so that the charge on the photoreceptor, which is uniformly charged by light passing through the imaging lens L° and the half mirror MQ, is erased leaving only one quadrant of the image. do.

In addition, when forming one digital VC image, the light from the imaging lens ryo received by the same-magnification image sensor 4 @?
, converts it into a digital image signal of 1 or 0 using a predetermined threshold as a reference, and then converts it into a digital image signal of 1 or 0 using a predetermined threshold value as a reference, and then converts it to an image portion through the digital mirror M4, half mirror MO, etc., in the same way as in the analog image above. Laser light is irradiated onto the photosensitive drum 5 so that the remaining charges are erased.

In the case of obtaining multiple recorded images (images) from the same original, in the former analog image forming method, the original lamp 2 and mirror must be moved and scanned each time, so it is difficult to form one image. Although it takes a lot of time, the latter digital image forming method stores the digital image signal obtained by scanning the original once and reproduces it each time it is exposed, allowing it to be used for writing without scanning the original. Since it is possible to obtain laser light of 11k, processing can be carried out in a short time.Additionally, it is also possible to easily add an image to a desired part of an image or erase a desired part of the image. .

For example, if a red filter that blocks the optical path and allows only red light to pass is provided in front of the same-magnification image sensor 4, an image portion containing a red component in a color document can be detected. Therefore, it is necessary to modulate the laser beam with a digital image signal extracted from images other than the image including the red component.VCJ
By simultaneous exposure of non-red image parts in a color original, it is possible to erase them from the a1 image of the analog image being carried on the photoreceptor drum 5, and to erase the non-red image part of the color original from the a1 image containing the red component. I can cough.

In addition to the red filter described above, if a filter that allows only other desired colors to pass through is configured to be switchable, it is possible to erase a desired image (image area) in a color document by switching the filter.

In this example, the optical system from the spear 1 mirror M1 to the imaging lens LVc is used both for analog double-double formation and technical image formation, and by interposing a half mirror, it is possible to create a same-size image as the photoreceptor. The same amount of iron is divided into sensors and images are formed. By sharing such parts, space efficiency can be improved and costs can be reduced. Also, when recording a variable magnification image of a document, there is no need to move the position of the same-magnification image sensor 4, which is placed at a position equivalent to the photosensitive surface of the photosensitive drum; 2 mirror M2. By moving the spear 6 mirror M3 a required distance, the required variable power function is obtained. ]・-Fumirror MO divides the optical path and also functions as an entrance for the laser beam. Example 2 (see Figure 2) In this example, two photoreceptor drums and two...-fmirrors are provided. , the paper feed path is also a consideration in terms of structure. Five of the constituent members common to those in the previous example are designated by the same reference numerals as in Figure 1-1.

On the optical path from the imaging lens L to the 1-magnification image sensor 4, two half mirrors Mol + M02 are arranged at intervals.
The reflected light from the no-fumira MO2 is focused on the photoreceptor drum 520 and the photoreceptor drum 51 through the fan 6 mirror M6. It's like being imaged.

That is, the half mirror MO1 has the ability to split the optical path of the light from the imaging lens L so that it reaches the mirror 5 mirror M5 and the mirror MO2.・-Fumira Mo1 Kamo Hikari wo Spear 2 Sensing body drum 52
It has the function of dividing the optical path so as to reach the same magnification image sensor/fourth.

Around the photoreceptor drum 51, according to the example of the fang 1,
In order of the rotational direction, the boundary device 90. Recording paper guide member 10
U, transfer charger 1102 separation charger 120° cleaning device 160. A main charger 140 and the like are arranged.

Also, around the double-sensor drum 52, there are developing devices 900. Transfer belt 19. Cleaning device 1300, secondary charger 20. A secondary charger 1400 and the like are provided. In addition, the laser beam from the imaging lens L is irradiated onto the drum 52 via the nof mirror MO2, and if necessary, the laser beam from the optical deflector 6 is irradiated onto the toroidal lens. 7, fθ = 8.114 mirror M4, 1-f mirror MO2, etc. for irradiation.

Next, the transfer belt 19 is a film-like cut/dress belt made of an insulating material, and a transfer charger 1100 is disposed inside thereof at a position facing the double photosensitive drum 52. Reference numeral 21 indicates a charger for removing static electricity from the belt. A charger 22 for adsorbing paper is disposed upstream in the rotational direction of the transfer belt 190 and facing the outer periphery, and a charger 26 for removing electricity from paper is disposed downstream.

The transfer belt 19 has a function of transporting the recording paper having the toner gap transferred from the double photoreceptor drum 52 to the transfer portion of the photoreceptor drum 51. The charger 22 is used to give charge to the transfer belt 19 to attract the recording paper, and the charger 25 is used to remove the charge from the recording paper. Charger 21
removes static electricity from the transfer belt 19.

The recording paper stored in the paper feed cassette 7) 24' is placed on the rotating plate 2.
6, the transfer belt 1 is moved through the rollers 27.
If you are led by 9, and if you are led by 28. 29. The case in which the recording paper guide member 1ooK is guided through 30 can be optionally adopted.

The recording paper stored in the paper feed cassette 25' is transported to the roller 31,
29. 30 and is guided to the recording paper guide member 100.

In this example, it is possible to form a two-color image in which, for example, one image of an arbitrary chromatic color in a color document is expressed in a different color from other images.

For example, when performing two-color printing of red and black, black toner is used in the developing device 90, and red toner is used in the developing device 90 [1]. In addition, a red filter (passes only red light) is interposed on the optical path between the fang 5 mirror M5 and the spear 6 mirror M6, and a red filter (red filter) is provided on the optical path immediately before the 1-magnification image sensor 4. (which only allows light to pass through) is used.

Then, on the photosensitive drum 51, there are an imaging lens L, a half mirror MOL, a spear 6 mirror M6, etc.? After that, a beam of light from the color original on the original table 1 is formed into an image.

During this printing, only the color light corresponding to the red side of the color original is irradiated by the function of the red filter, and a latent image of only a non-red image is formed.

Then, this latent I is developed as a black toner image by a developing device.

On the other hand, an image containing a red component in a color document can be developed on the same-magnification image sensor 4 as described in the first embodiment.

Note that a half mirror MO2 is mounted on the fang 2 photoreceptor drum 52.
The entire image portion of the color document is imaged through the color document, and a latent image is carried thereon. This latent image is exposed and scanned simultaneously with laser light modulated by the digital signal, leaving only the latent image corresponding to the red image in the color original, and erasing the rest. This latent image is then developed with red toner in the developing device 900 to obtain a red toner image.

Therefore, first, the red toner image on the double photoreceptor drum 52 is transferred to the recording paper fed from the paper feed cassette 24' to the transfer belt 19, and then the red toner image is transferred by the transfer belt 19 to the photoreceptor drum 52. The black toner on the drum 51 transfers
Obtain a two-color image.

In addition to the above-mentioned usage, it is of course possible to use it by making use of only the analog acid function or by making use of only the digital formation function.

Further, by providing the half mirror MO2, it is also possible to develop an image formed in an analog manner on the double-sensor drum 52 with red toner.

Practical Example 6 (See Figure 2) In the configuration shown in Figure 2, the configuration is such that the humirar MO2 is removed.

In this case, the analog image on the photoreceptor drum 51 and 1.
It is possible to synthesize the digital images on the two-sensor drum 52.

As the digital image single image exposure means, an FL play (fluorescent display tube array) or an LED array can also be used.

(Effects) In the present invention, since the imaging optical system for analog image formation and the imaging optical system for digital double-layer formation are shared1, it is possible to use a dedicated optical system for 1-magnification image processing. Therefore, it is possible to provide a multi-functional image forming device (2) that can freely select between an analog image and a digital image with a simple configuration and a small number of parts.

Also, using a 1-magnification image sensor,
Since the image is formed of a residue of the same size as the elephant, no special processing operation is required for variable-magnification copying.

Furthermore, it can also be used for writing with a half-mirror laser beam for optical path division.

[Brief explanation of drawings]

Figure 1 is a front view illustrating a schematic configuration of an image forming apparatus according to an actual example of the present invention, and Figure 2 is a front view of an image forming apparatus illustrating another example. 1... Document placement table, 4... Life-sized image sensor, 5
゜51... Photosensitive drum, 52... 2 photosensitive drums, L... Imaging lens, MO river - Fumira-6

Claims (1)

[Claims] A light image is formed on a uniformly charged photoreceptor in the dark, and the electrostatic latent image is developed with toner, transferred to recording paper, and then fixed. An image forming device that can be turned over to form a single image on a recording surface includes an imaging optical system that images reflected light from a document placed on a document mounting table on a predetermined image forming section; an optical path splitting means that splits the optical path of the reflected light emitted from the system toward the photoreceptor as the imaging section and the same-magnification image sensor; and photoelectric conversion of the information of the light imaged on the same-size image sensor. The photoreceptor or a spear provided separately from this photoreceptor is
An image forming apparatus characterized by having a digital image exposure means for exposing a light body.