JPS62973A - Copying device - Google Patents

Abstract

PURPOSE:To easily and exactly assign a region for partial extraction or erasure of an original image by projecting the original image to the projection part at the same magnification as the magnification to be imaged on a photosensitive body by a projecting means and assigning the region for copying by the index in the projection part. CONSTITUTION:The projecting means 16 forms the projected image of the same magnification as the magnification at which the original image is formed on the photosensitive body 3 onto a screen 15 and the positions of a projecting lens 19, a screen 15 or mirrors 18, 20 are moved according to the magnification. An operator assigns the region by moving and operating the index provided to the screen 15 while viewing the image displayed on the screen 15, then the respective coordinates of the index are read by a detector and the region is automatically set. The coordinate position of the region assigned on the screen 15 can be adjusted by controlling eraser 14 while viewing the image as it is as the original image is formed on the same size on the body 3 as well.

Description

TECHNICAL FIELD The present invention relates to a slit exposure type copying apparatus equipped with a moving scanning optical system.

2. Description of the Related Art Conventionally, some copying apparatuses are capable of extracting a specific range of a document image and making a sample copy or erasing only that part. In a device having such an arbitrary range erase function, it is necessary to specify an area to be extracted or an erase area in the original image. In this regard, in the past, the document was placed in a transparent sheet 1 on which the coordinates were drawn.
- The area is specified by reading the coordinates of the area and inputting them manually using a numeric keypad or the like. but,
In the case of such a method, when copying, it is necessary to set the original on a transparent sheet and read its coordinates, which is time-consuming.

Also, even if the area is specified in this way.

When the original is set on the original table, the JM original is shifted, causing a problem that the input coordinate position and the position of the desired area to be extracted are misaligned. Furthermore, in the case of a device having a variable magnification function, the specified position on the document and the copy position on the transfer paper are different from each other, so it is necessary to calculate the position on the transfer paper using a circuit.

Purpose The present invention has been made in view of the above points, and an object of the present invention is to provide a copying device that can easily and accurately specify an area when copying an area in which only a part of a document image is desired to be extracted or erased. purpose.

Structure In order to achieve the above object, the present invention provides a slit exposure type copying system that is equipped with a moving scanning optical system that exposes an image of a document set on a document table to slit light and forms the image on a photoreceptor at a specified magnification. The apparatus is provided with a projection means for projecting an image of the document set on the document table at the same magnification as the magnification at which the image is formed on the photoreceptor, and a projection section on which the projected image is displayed; The present invention is characterized in that an erase means is provided for erasing the electrostatic latent image formed on the photoreceptor based on the region designation of the original image by the projection section.

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. First, a document table 2 is provided on which a document 1 to be copied is set. Pickpocket this manuscript 1, Tsu 1
- Optical system 4 that exposes light and forms an image on the drum-shaped photoreceptor 3
is provided. This optical system 4 includes an exposure illumination lamp 5
and first to
It is composed of three mirrors 6 to 8, an imaging lens 9, and a fourth mirror 10. Here, the exposure illumination lamp 5
The first mirror 6 is used as a first scanner 11 to expose and scan one side of the original, and the second and third mirrors 7.8 are used as a second scanner 12 and scan 1/2 of the first scanner 11.
moving in the same direction at a speed of Further, a charger 13 is provided around the photoreceptor 3. Eraser 14 and the like serving as erasing means are arranged according to an electrophotographic process.

This is the schematic configuration of a slit exposure type copying apparatus. An image of a document is sequentially exposed to slit light by an exposure illumination lamp 5, and the reflected light is reflected from the first to third mirrors 6 to 8, the imaging lens 9, and the fourth mirror. An electrostatic latent image is formed on the photoreceptor 3 via the electrostatic latent image. An unnecessary portion of this electrostatic latent image is erased by an eraser 14 and developed by a developing device. The image is then transferred to a transfer paper by the action of a transfer charger. Here, this copying apparatus has a variable magnification function, and the imaging lens 9 and the like move according to the specified magnification.

Therefore, in this embodiment, a screen 15 serving as a projection section is provided in parallel with the document table 2 for such a copying apparatus. A projection means 16 is provided for projecting an image of the document 1 set on the document table 2 onto the screen 15. The projection means 16 includes a projection lamp 17 that exposes the entire surface of the document 1 on the document table 2, a first projection mirror 18 that receives reflected light from the document 1 and forms a projected image on the screen 15, and a projection lens. 19 and a second projection mirror 20 = This projection means 16 projects a projected image onto the screen 15 using the optical system 4 at the same magnification as that used to form the original image on the photoreceptor 3.
Depending on the magnification, the projection lens 19, the screen 15, or the projection tubes 1 and 2 mirrors 18 are formed.
．． 20 positions are moved.

Here, the state of the original 1 and the state of the original image on the screen 15 are explained using FIGS. 2(a) and 2(b).
'explain. First, FIG. 2(b) shows the state of the original 1 set on the original platen 2 with the original surface facing down, and the area 21 shown with diagonal lines is the area to be specified. Such an image of the original 1 is displayed on the screen 1 as shown in FIG. 2(a).
5 is projected and displayed. The projected and displayed image has the same size as the electrostatic latent image formed on the photoreceptor 3, and when the magnification is changed, the image is magnified according to the magnification.

However, in this embodiment, in order to make it possible to specify the area 21 while looking at the projected image of the document 1 projected on the screen 15, the screen 15 is provided with an index as shown in FIG. 22a, 22b, 23a, and 23b are provided. These indicators 22a and 22b are movable in the X direction, and the indicators 23a and 23b are movable in the Y direction.
Coordinate.

A detector is provided to detect the Y coordinate.

With this configuration, if you want to extract only a certain area of the original 1 image and erase other areas, or to obtain a copy in which only a certain area is erased, set M original 1 on the original table 2. and project it on the screen 15. In this state, while looking at the image displayed on the screen 15, select the indicator 22a.

22b, 23a, and 23b are moved to create an area @2 surrounded by these indicators 22a, 22b, 23a, and 23b.
1 can be specified as the area. In other words, the coordinates of the indicators 22a to 23b are read by the detector and the area 21 is automatically set. This is the same even when the magnification is changed; since the image with the designated magnification is projected and displayed on the screen 15, the area can be specified while viewing the magnified image. The coordinate position of the area 21 designated on the screen 15 can be adjusted by controlling the eraser 14 as it is, since the document image is formed in the same size on the photoreceptor 3 as well.

In other words, the eraser 14 is made by arranging a large number of light emitting sources such as LEDs in the width direction of the photoreceptor 3, and is capable of erasing any size.In the Y direction, each LED of the eraser 14 is turned on and off. The area control is performed by controlling the ON/OFF timing of the eraser 14 in the X direction.

As described above, according to this embodiment, when it is desired to copy a partial area or copy an erased partial area, the area 21 can be specified as usual on the original 1 when copying.
This can be done while viewing the original image projected on the screen 15 while the original is set on the original table 2.

Therefore, there is no trouble such as resetting the document 1 after specifying the area 21, and the IM document 1 is in the same state at the time of specifying the area and at the time of copying, and there is no positional shift, so the area 21 can be accurately specified. can be caused to perform partial copying or deletion. Furthermore, even when copying at a variable magnification, the area 21 can be specified while viewing the original image projected on the screen 15 in a magnified state, and there is no need to perform calculations. Can be done easily and accurately.

Note that in this embodiment, movable indicators 22a to 23btt are provided with respect to the screen 15, and these indicators 22a to 23btt are provided.
The coordinate position of the area 23b was read by a detector and the area 21 was automatically set and inputted, but as shown in FIG. An index 24 in the Y direction is provided, and while looking at the original image projected on the screen 15, the coordinates of A and C or the coordinates of B and D of points A to D in the area 21 are read using the index 24, and the coordinates are read using the numeric keypad or the like. It may be possible to use key human power.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In this embodiment, a projection means 25 that shares the optical system 4 is provided. For this reason, the fourth mirror 10
The fourth mirror 10 is rotatably displaceable, and during copying operation this fourth mirror 10 is in the state shown by the solid line, but during projection it is rotated 45@ to the state shown by the broken line to project the original image onto the screen 26. be. At this time, the fourth mirror 10
and the distance between the photoreceptor 3 and the fourth mirror 10 and the screen 26
The distance between the photoreceptor 3 and the screen 26 is made equal, so that the image formed on the photoreceptor 3 and the image projected onto the screen 26 have the same size and are not blurred. Here, this screen 26
The image projected onto the screen 26 by the optical system 4 has a width equal to the slit width of the slit exposure multiplied by the stepped magnification (magnification at the time of copying), and is not an image of the entire document, so the width of the screen 26 is short. has been done. Therefore, the index is also shown in Figure 5 (b).
As shown in the figure, only the fingers 11123a and 23b in the Y direction are movably provided, and a pointing line 27 is used in the X direction. That is, the designation of the area 21 in the Y direction is performed using the indicators 23a and 23b, as in the case described above. On the other hand, in the X direction, since the entire original image is not projected and displayed on this screen 26, it is necessary to move the optical system 4 (therefore, the projection means 25) with respect to the original 1.

As the means for moving the optical system 4, a motor may be used to move and scan the optical system 4 during copying, but the optical system 4 may also be moved by manual operation.

In this way, while moving the optical system 4, the original image is sequentially projected and displayed on the screen 26, and the desired area 21 is
When the leading and trailing ends of the screen 26 are located on the instruction line 27, the position can be specified by operating a button or the like. In other words, when you press the button,
Reading the distance by counting the number of pulses from the home position of the optical system 4 to this point, etc.
A detection means such as a photosensor may be provided corresponding to the instruction line 27.

Effects As described above, in the present invention, the original image is projected onto the projection unit at the same magnification as the image formed on the photoreceptor by the projection means to specify an area for extraction copying, etc., which is necessary for copying. The area can be specified while viewing the image of the original on a projection unit while the original is set on the original table, and the area can be specified simply and accurately without fear of misalignment.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a first embodiment of the present invention, and FIG.
Figures (a) and (b) are plan views, Figure 3 is a plan view of a screen portion showing a modified example, Figure 4 is a schematic side view showing a second embodiment of the present invention, and Figure 5 (a). . (b) is a plan view. 1... Original, 2... Original table, 3... Photoreceptor, 4...
...Optical system, 14...Eraser (erase means), 1
5... Screen (projection unit), 16... Projection means,
21... Area, 22a-23b... Index, 24...
・Indicator, 25... Projection means, 26... Screen (
Projection Department) Applicant: Ricoh Co., Ltd. -r:i
, J, i': ++1'' Figure JJ, 15th floor (a) (b')

Claims (1)

[Claims] In a slit exposure type copying device equipped with a moving scanning optical system that exposes an image of a document set on a document table to a slit and forms the image on a photoreceptor at a specified magnification, the magnification at which the image is formed on the photoreceptor. A projection means for projecting an image of the document set on the document table at the same magnification as , and a projection section on which this projected image is displayed are provided, and an index is provided on the projection section to determine the area of the document image on the projection section. A copying apparatus comprising an erase means for erasing an electrostatic latent image formed on the photoreceptor based on a designation.