JPH01106080A - Image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an image forming apparatus applied to, for example, an electrophotographic copying machine, and particularly to an image forming apparatus equipped with an instruction means for specifying an unnecessary portion of a document. Regarding.

(Prior Art) Generally, an electrophotographic copying machine copies an original image directly onto transfer paper, or enlarges or reduces the original image and copies it.
1 Has residue. By the way, there may be unnecessary parts in the original image. Conventionally, a method using a digitizer has been devised to specify the unnecessary parts of the original, but this method requires the original to be placed on a digitizer tablet. ? The device was placed in the position L, and the range was specified using a pen or the like.

(Problems to be Solved by the Invention) However, with such conventional technology, it is necessary to place the original on the original platen again during copying, which is cumbersome to operate, and the accuracy of the digitizer is greatly improved because the original moves. Even if it were, there was a problem in that it was absorbed by the deviation during movement, making it impossible to specify a highly accurate range.

As a means to solve this problem, Japanese Patent Application Laid-Open No. 61-223861
There is something disclosed in the publication No. In such a conventional example, a spot light is irradiated onto the original image, the spot light is moved to specify an erasing range, and the photosensitive drum is irradiated with light corresponding to the specified erasing range to erase the electrostatic potential. It erases images or charges and copies them. However, in this conventional example, the area is specified by irradiating a spot light from below the document table, so there is a problem that it cannot be used when the document is made of nine thick sheets of paper that do not transmit light.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional example, and its purpose is to cover a highly accurate document range without moving the document, even for documents that do not transmit light. An object of the present invention is to provide an image forming apparatus that allows specification.

(Means for Solving the Problems) In order to achieve the above object, the present invention optically scans a document placed on a document table, and the reflected light is charged. In an image forming apparatus that forms an image on an image carrier to form a charge pattern, develops it, and then transfers and fixes it to a transfer material to form an image, a liquid crystal panel is disposed so as to be superimposed on the document from above. an instruction means for instructing a predetermined range of the document by displaying on the liquid crystal panel; a charge erasing means for erasing the charge of a portion corresponding to the indicated range during image formation; and operating the instruction means. It is configured by having an operation means.

(Function) In the present invention having the above-mentioned configuration, since the specified range is displayed on the liquid crystal panel, the specified range can be visually checked even though the actual document cannot be visually observed even for a document through which light does not pass. Furthermore, since the designated range is displayed after being superimposed on the original, it is possible to designate a range that is independent of the position where the original is placed.

(Example) The present invention will be explained below based on the illustrated example. 1st
The figure is a perspective view showing the appearance of an electrophotographic copying machine to which an embodiment of the image forming apparatus according to the present invention is applied. In the figure, l is an outer box, 2 is a document table, and 3 is a transparent liquid crystal panel , is rotatably disposed between the document pressure plate 4 and the document table 2, and is also disposed so as to be superimposed on the document from above. 5
is an operation panel as an operation means.

FIG. 3 shows the internal structure of the electrophotographic copying machine shown in FIG. , is guided to a photosensitive drum 12 as an image carrier. Then, the light source 6, the reflecting mirror 7, and the reflecting mirror 8.9 each move in the direction of the arrow at a predetermined speed to scan the original. on the other hand,
After the surface of the photosensitive drum 12 is uniformly charged by the primary charger 19, an electrostatic latent image corresponding to the original image is formed, and the image is developed by the developer 11. Further, the transfer paper 20 is fed to a registration roller 21 by a paper feed roller 14 loaded in a cassette 15, and the registration roller 21 is rotated at a timing such that the developed image on the photoreceptor drum 12 and the transfer paper 20 coincide. The transfer paper 20 is fed in, and an image is transferred from the surface of the photosensitive drum 12 onto the transfer paper 20 by a transfer charger 16, and the image on the transfer paper 20 is further fed into a fixing device 17, where the image on the transfer paper 20 is fixed. On the other hand, residual toner is removed from the surface of the photosensitive drum 12 by a cleaner 13, and the next copying process is started again.

In the above configuration, a user places a document a on the document table 2, and during normal use, a transparent liquid crystal panel 3 is placed on top of the document. A cursor serving as an instruction means is displayed on the liquid crystal panel 3, and the cursor can be moved using keys 5a to 5d on the operation panel 5. By the way, if you want to copy only the range PQR3 as shown in FIG. 6, move the cursor on the LCD panel 3 to point P and press key 5e.Then move the cursor to p+Q-R.
If you move it with +S, the cursor will leave a trail. Further, when the key 5f is pressed, the liquid crystal in the area surrounded by PQR3 closes and does not allow light to pass through, and the range specified by the user is displayed as shown by diagonal lines in FIG. At this time, the microcomputer 30 shown in FIG. 5 stores the specified range in the memory 31.

Next, when a copy key (not shown) is turned on, the transfer paper 20 is fed from the cassette 15 as described above, the original is exposed, and a static TIt latent image is formed on the photosensitive drum 12. Further, as shown in FIG. 4, an LED array 18 in which a large number of light emitting elements such as LEDs are arranged in the axial direction of the photoreceptor drum 12 is disposed around the photoreceptor drum 12 as a charge erasing means. The area where the latent image is formed is re-exposed to erase the image. At this time, the microcomputer 30 shown in FIG. 5 manages the driving timing of the motor 33 of the paper feed roller 14 and registration roller 21 via the motor driver 32, and operates to erase the specified range.

Further, in FIG. 5, the microcomputer 30 also controls the heater 35 of the fixing device 17 through the heater driver 34. In addition, 36 is a liquid crystal driver for driving the liquid crystal panel 3, and 37 is an LED array driver for lighting the LED array 18.

The above is the procedure for copying a specified area of a document.As shown in Figure 7, to reverse the inside and outside of the area, press key 5g instead of key 5f to copy the specified area in the same way as above. It will be done.

In this embodiment, by installing the light source 6 under the document table 2, the document can be seen from the back side and can be viewed with the naked eye, making it easier to specify the range.

As described above, according to this embodiment, it is possible to easily specify the range of a document with high precision, especially for a translucent document. Moreover, it is possible to visually confirm the area designated by the user, and erroneous designation can be prevented. On the other hand, even for originals that do not transmit light, the designated range is displayed on the range designation liquid crystal panel, so it is possible to visually check the designated range although the actual original cannot be visually checked. In the conventional example, the specified range is displayed using transmitted light, but in this embodiment, the specified range is displayed after being superimposed on the original, so that the range can be specified without being affected by the translucency of the original. Can be done.

(Effects of the Invention) The image forming apparatus according to the present invention has the above-described configuration and operation, and even if the document does not transmit light, it is possible to specify the document range without moving the document. This has the effect of improving operability and achieving higher precision.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the external appearance of an electrophotographic copying machine to which an embodiment of the image forming apparatus according to the present invention is applied, FIG. 2 is a plan view of FIG. 1, and FIG. 3 shows the inside of FIG. 1. FIG. 4 is a schematic configuration diagram showing the surroundings of the photosensitive drum in the same embodiment, FIG. 5 is a block diagram showing the control system of the same embodiment,
FIG. 6 and FIG. 7 are explanatory diagrams of range designation in the same embodiment, respectively. Explanation of symbols 2...Original table 3...LCD panel 5...
・Operation panel (operation means) 6... Light source 12... Photosensitive drum (image carrier) 18... LED array (charge erasing means) 30... Microcomputer Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] A document placed on a document table is optically scanned, and the reflected light is imaged onto a charged image carrier to form a charge pattern, which is developed and then transferred and fixed onto a transfer material. An image forming apparatus that forms an image by using a liquid crystal panel that is arranged to be superimposed on the original document from above, an indicating means for indicating a predetermined range of the original document by a display on the liquid crystal panel, An image forming apparatus comprising: a charge erasing means for erasing charges in a portion corresponding to the range during image formation; and an operation means for operating the instruction means.