JPS6336277A - Printing device - Google Patents

Abstract

PURPOSE:To miniaturize a device and to reduce the cost of a printing device and to improve the picture quality of the printer by setting up a light emitting element array on an original placing table, selectively emitting light based on an image signal, and forming its optical image on a latent image carrier through a mirror in a mirror scanning means and a copying image formation means. CONSTITUTION:When an image signal is inputted to an LED array 7 in case of executing printing based on the external image signal, respective light emitting elements are selectively emitted based on the input signal. The optical image is formed on the surface of a photosensitive drum 1 through mirrors m1-m4 and an optical lens 6 to form an electrostatic latent image corresponding to the image information. The latent image is developed, transferred and fixed to form a print. After completing the printing, the light emitting elements on the LED array 7 are uniformly emitted and electrostatic charge on the drum 1 is uniformly discharged similar to a copying mode.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention sequentially illuminates the surface of a document on a document table in the form of slits, and forms a reflected light image on a photoconductive latent image carrier. A copying function that forms a latent image of the original is performed, and the light emitting elements of the light emitting element array are selectively emitted according to the image signal, and this light image is formed on the latent image carrier. It relates to a printer device having a writing function for forming a latent image of image information, and in particular, a copying imaging means for forming a reflected light image from the surface of the document onto a latent image carrier, and a light emitting liner. By configuring the device 6' and the image forming means for forming the light image of the sun on the latent image carrier to be one image forming means, the apparatus 6''
The present invention relates to an improvement of a printer device that aims to reduce . . . , miniaturize the device, and improve image quality.

[Prior Art] Conventionally, this type of printer device, etc.]
An electrophotographic copying machine as described in Japanese Patent No. 867 is generally known.

That is, as shown in FIG. 2, this device includes a photoconductive photosensitive drum (a) that is disposed inside the main body of the device and rotates in the direction of the arrow, and a photosensitive drum (a) that is fixedly arranged above the photosensitive drum (a). and an illumination device that is movably provided along the lower surface of the document platform (b) and sequentially illuminates the surface of the document (c) on the document platform (b) in a slit shape. lamp(
d), a mirror-scanning illumination means (e) consisting of a full-rate mirror (ml) and a half-rate mirror (m2);
Then, the repulsed light image from the original (C) is transferred to a fixed mirror (m
), (m4) for forming an image on the photosensitive drum (a) and (m4); A light emitting element row (q) emitting light from a light emitting element -r of a plurality of arranged LIE Ds (light emitting diodes) 817, and this light emitting element row (
The light image from g) is formed onto the surface of the photosensitive drum (a)1! The main part of (a) is composed of a writing imaging means (f2) for writing, and a charger (f2) is provided along the outer peripheral surface of the photosensitive drum (a).
h), a developing device (1), a transfer device (, j), a cleaning device (k), etc. are arranged.

In this apparatus, the document mounting table (b) is placed on the photosensitive drum (a) which is uniformly charged by the charger (h).
) on the original (C) or a light image from the light emitting element array (g) selectively emitted based on an image signal, the image forming means for copying or writing (fl
) (f2) to form an electrostatic latent image of these optical images, this latent image is developed with toner by a developing device (i), and this toner image is transferred to a recording sheet (j), This is then fixed to obtain a printed matter. Note that the photosensitive drum (a> rotates after printing 1 to 1), and during that time, the light emitting element array (g> uniformly emits light to erase the static charge on the photosensitive drum (a), and the cleaning device (k), the remaining toner is removed and the printer is used for the next operation.

[Problems to be solved by the invention] By the way, in this type of printer device, the document (C)
a copying imaging means (fl) for forming a reflected light image from the photosensitive drum (a) on the photosensitive drum (a) surface; and a copying imaging means (fl) for forming a light image from the light emitting element array (C+) on the photosensitive drum (Fl) surface. It is necessary to construct the writing imaging means (r2) for each of the two separate members, and there is a problem that the cost of the valve device is relatively high, and additional space is required. There was a problem that the body became larger.

In addition, in the conventional device, 1. Jl light emitting element row (a)
is disposed near the photosensitive drum (a), and a convergent optical fiber bundle (Cell 7 nooklens row: trade name) is used as the writing imaging means (f2). However, since this focusing optical fiber bundle has a shallow depth of focus, the writing imaging means (f
2) and the light-emitting element row (g) are arranged with a slight deviation from the proper position, the light image from the light-emitting element row (0) is formed on the photosensitive drum (a) and the light is emitted. This poses a problem in that the quality of the printed image deteriorates significantly.

On the other hand, in order to improve the print image quality, it is necessary to adjust the arrangement dimensions between the photosensitive drum (a) and the writing imaging means (f2), and between the filling imaging means (f2) and the light emitting element array (q). There was a problem in that the installation work was complicated, as it had to be done carefully.

[Means for Solving the Problems] The present invention has been made by paying attention to the above-mentioned problems, and its object is to combine each of the imaging means described in J- with one image-forming device for copying. It is an object of the present invention to provide a printer device which can be shared by means, reduce the number of printers, reduce the size of the device, and improve the image quality.

That is, the present invention sequentially illuminates the surface of the document on the document table in a slit shape using a mirror scanning type illumination means movably arranged along the lower surface of the document table fixedly arranged, and the reflected light is a copying function for forming an m-image of a document by forming a light image on a photoconductive latent image carrier through an imaging means for copying; A writing function that selectively causes the light emitting elements of the light emitting element array to emit light based on an image signal, and forms a latent image of image information by forming this light image on a latent image carrier via a writing imaging means. Assuming a printer device m comprising The present invention is characterized in that the light image from the light emitting element array is formed on the latent image carrier through the mirror of the mirror scanning illumination means and the copying image forming means.

In such technical means, the position of the front stage of the light emitting element array on the document table is such that it does not interfere with the formation of a latent image on the document placed on the document table in the copying mode, and it is also possible to position the light emitting element array on the document table in a manner that does not interfere with the formation of a latent image on the document placed on the document table in the copy mode. 1) Any position where the light image from the light emitting element array can be formed on the latent image carrier can be used, for example, at the end of the document table on the forward direction side of the mirror scanning illumination means. It may be attached to the original plate on the opposite side (JG), or it may be attached to the end of the document table on the opposite side (JG).

[Function] If the above-mentioned technical means is used, the light emitting element array described above is attached to the document table, and the mirror scanning type illumination means is moved to an appropriate position to produce a light emitting device attached to the document table. Since the light image from the element array is formed on the latent image carrier through the mirror of the mirror scanning type illumination means and the above-mentioned image forming means for copying, the installation of the image forming means for writing is omitted. can do.

[Example 1] Hereinafter, an example of the present invention will be described in detail. As shown in FIG. 1, the printer device of the present invention includes a photosensitive drum (1) provided inside the main body of the device;
A document placement table (2) is fixedly placed on the upper side, and a document (3) surface on the document placement table (2) is installed so as to be movable back and forth along the bottom surface of this document placement table (2). A mirror scanning illumination means (5) consisting of an illumination lamp (4), a full-rate mirror (ml), and a half-rate mirror (m2) that sequentially illuminates the image in a slit shape, and a reflected light image from the original (3). An optical lens (6) for forming an image on the surface of the photosensitive drum (1) via fixed mirrors (m3) and (m4)
, an L provided across the width direction of the document mounting table (2) on the forward direction side of the mirror scanning type illumination means (5).
The main part is composed of the ED array (7), and along the outer peripheral surface of the photosensitive drum (1) are a charger (8), a developer (9), a transfer device (10), and a cleaning device (11).
etc. are arranged.

In order to obtain a copy of the document (3) placed on the document table (2) using this device, the device is set to copy mode by operating an operation button (not shown), as shown in FIG. As shown in , the mirror scanning illumination means (5) is continuously moved from the position shown by the solid line to the position shown by the broken line to sequentially illuminate the surface of the document (3) in a slit shape, and the charger ( 8
) 1 light image from the surface of the original 1 (3) is formed on the surface of the photosensitive drum (1), which is uniformly charged by the photosensitive drum (1) and rotates in the direction of the arrow, via the optical lens (6), thereby forming the original ( 3) Forming an electrostatic latent image.

Next, this latent image is developed into a visible image by a developing device (9), and this 1-boo image is transferred onto a recording sheet (12) by a transfer device (10). (not shown) to obtain a copy of the original document (3).

On the other hand, after the copying is completed, the photosensitive drum (1) continues to rotate in the direction of the arrow, and the residual toner is removed by the cleaning device (11), and the mirror scanning illumination means (5)
is configured to move with its illumination lamp (4) turned off and stop at the position indicated by the dashed line. At this time, the stop positions of the full-rate mirror (ml) and half-late mirror (m2) are indicated by the LEDs.
In order to enable the optical image from the array (7) to be formed on the surface of the photosensitive drum (1), the optical path length (TC) from the IED array (7) to the surface of the photosensitive drum (1) is as follows. It is adjusted to stop at a position that satisfies the relationship shown by the formula.

TC-(1+1/m)f 10(1+m)f However, (1+1/m)f: LED array (7) and optical lens (
6) Open optical path length (10 m) f: Optical lens (6) and photosensitive drum (1) open path length f: Focal length of optical lens (6) m: Exposure magnification of light image from LED array (7) In this state, the light emitting elements of the LED array (7) uniformly emit light to erase the static charge on the photosensitive drum (1).

On the other hand, in order to print 1 q of objects using this device based on an image signal from the outside, the above-mentioned mirror type scanning means (5) is operated by operating the operation button to put this device into the writing mode. Start moving with the lighting lamp (4) turned off and stop at the position indicated by the dashed line.J
: Composed of sea urchins. In this case as well, the above full rate mirror (ml) and half rate 1~ mirror (
The stopping position of rT12) is such that the optical path length (TC) from the LED array (7) to the surface of the photosensitive drum (1) is the above equation, that is, TC = (1 + 1/m) f + (1,000 m) f. Adjusted accordingly to satisfy the relationship. At this time, when the light image from the LED array (7) is magnified and formed on the surface of the photosensitive drum (1), that is, when m≠1 in the above equation, each of the mirrors (m) , (m2), the optical lens (6) may also be configured to move appropriately to a position that satisfies the equation.

Next, an image signal is input to the LED array (7), and when each light emitting element selectively emits light based on this signal, this light image is transmitted to each mirror (ml), (m ), (m
3), (m4) and the optical lens (6), an image is formed on the surface of the photosensitive drum (1), and an electrostatic latent image corresponding to the image information is formed on the photosensitive drum (1). In this device, the optical image from the IED array (7) is transmitted onto the surface of the photosensitive drum (1) through a normal optical lens (6) instead of the conventional focusing optical fiber bundle with a shallow depth of focus. Since the image is formed, a high-resolution latent image can be formed on the surface of the photosensitive drum (1).

Then, this latent image is developed, transferred, and fixed in the same steps as in the copying mode described above, thereby producing 1q prints based on external signals.

After printing 1 to 1, the light emitting elements of the above +-"l" array (7) uniformly emit light, so that the static charge on the photosensitive drum (1) is uniformly erased just like when copying. It has become.

[Effects of the Invention] As described above, the printer device of the present invention uses one unit as an image forming means for forming a reflected light image from the document surface and a light image from the light emitting element array on the latent image carrier. Since it can be shared with two image forming means for copying, and the installation of an image forming means for writing can be omitted, it has the effect of reducing the device cost and downsizing the entire device. In addition, since the shared image forming means can be configured with a normal optical lens, it is possible to form each optical image on the latent image carrier with high precision, which improves print image quality. It has the effect of achieving

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 2 shows a schematic configuration explanatory diagram of a printer device of the present invention, and FIG. 2 shows a schematic configuration explanatory diagram of a conventional printer device. [Shunzuki explanation] (1)...Photosensitive drum (2)...Document mounting table (3)...Document (4)...Illumination lamp (5)...Mirror scanning type illumination means (6 )...Optical lens (7)...LED array patent Applicant: Representative of Fuji Xerox Co., Ltd. Patent attorney: Tomohiro Nakamura (2 others) 3: Hara Hara 4: Screaming Rumpf. 5: Mirror foot type Rgu, Akiyuki 6-, N11yu, Gakuren χ' 7: LEI) Array Fig. 1 Fig. 2

Claims (1)

[Claims] A mirror-scanning illumination unit movably provided along the lower surface of the fixed document table sequentially illuminates the document surface on the document table in a slit shape, and the reflected light image is formed into an image for copying. A copying function that forms a latent image of an original by forming an image on a photoconductive latent image carrier through a means, and a light emitting element of a light emitting element array provided near the latent image carrier to generate an image signal. In the printer apparatus, the light emitting element array has a writing function that selectively emits light based on the light emitting element and forms a latent image of image information by forming a light image on a latent image carrier through a writing imaging means. At the same time, the mirror scanning type illumination means is moved to an appropriate position and the light image from the light emitting element array attached to the document table is transmitted to the mirror of the mirror scanning type illumination means and the above-mentioned copying image. A printer device characterized in that an image is formed on a latent image carrier through means.