JPS63235969A - Copying device - Google Patents

Abstract

PURPOSE:To prevent a black frame from being formed in the periphery of an image on copying paper, and to execute an exact partial copying by providing a liquid crystal panel which is brought to a light transmission control by synchronizing with a scanning movement of a projected image, on a slit. CONSTITUTION:With regard to a projected image, a tip and a rear end 57, 57 for copying it in the scanning direction are instructed suitably by an image instructing means 53. A liquid crystal panel 63 is provided on the whole area of a slit 62, a light transmissivity extending from light transmission to light shielding is varied, and said panel is brought to a light transmission control by synchronizing with a scanning movement between the tip and the rear end with regard to the image, based on a signal from the image instructing means 53, and brought to light shielding except this light transmission control part. Also, on a photosensitive body 13, other part than the projected image, or an unnecessary part in the image is shuttered surely in a state that its boundary is clear, and brought to light shielding. In such a way, even when an enlarged and projected image is smaller than a size of copying paper which is fed, formation of a black frame in the periphery of an image on the copying paper is prevented surely, and the partial copying is executed exactly.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to copying apparatuses such as reader printers and electronic copying machines. In other words, it relates to a copying device that scans and moves an original and an optical system relative to each other, projects an image of the original illuminated by light from a light source onto a photoreceptor through a slit, and copies it onto copy paper. be.

``Prior Art'' In such a copying device, such as a reader printer, in the so-called negative-positive mode in which a positive image is copied from a negative image original, that is, a microfilm, the enlarged and projected image is smaller than the size of the copy paper. Then, a black frame is formed around the image on the copy paper due to the surrounding optical path. The formation of such a black frame is not only unsightly, but also increases the amount of toner consumed for development, and is also undesirable because it places a burden on both ends of the blade.

On the other hand, when using a copying apparatus, there is a strong need for so-called partial copying, in which only necessary parts are copied from images on microfilm, and other unnecessary parts are not copied.

Conventionally, the following mechanical shutter system was used to prevent the formation of black frames and to perform partial copying.

That is, the slit is provided with opposing light-shielding plates that are movable from both sides, for example, in the lateral and longitudinal directions of the slit, or in the scanning direction and image width direction of the projected image, and these light-shielding plates are moved by a drive mechanism. This method mechanically shutters areas other than the projected image to block light, thereby preventing the formation of black frames on copy paper.

Further, by using a similar light-shielding plate, unnecessary portions of the projected image are mechanically shuttered and light-blocked, thereby performing partial copying in which only the necessary portions are copied.

"Problems to be Solved by the Invention" By the way, the following problems have been pointed out in such conventional examples.

First of all, since the photoreceptor, charger, eraser, etc. are densely arranged near the slit, it would be difficult to add a light shielding plate, its drive mechanism, etc. there, which would complicate the configuration. It was not easy to do so, and it also caused a cost increase. This has been a serious problem, especially when the photoreceptor drum has a small diameter.

Second, the light shielding plate and its driving mechanism must correspond accurately to the projected image, requiring extremely high component precision, which has also led to an increase in cost.

Thirdly, despite the above, the correspondence to the projected image is often inaccurate, the boundary between the image and its surroundings is blurred, and a black frame is often formed, which is still unsightly. It was pointed out that the amount of toner consumed increased and the burden on the blade was increased.

Fourth, when partially copying, the boundary between the necessary and unnecessary parts of the image becomes unclear, and the edges and edges of the partial copy become blurred.
Blurred boundaries, omissions, overcopying, etc. may occur, resulting in inaccurate partial copies.

In the conventional example, the above points were pointed out.

In view of these circumstances, the present invention has been made to solve the problems of the conventional methods described above, and includes a liquid crystal panel in which a liquid crystal panel whose light transmission is controlled in synchronization with the scanning movement of a projected image is provided in a slit. We propose a copying device that easily and reliably prevents the formation of a black frame around an image on copy paper without taking up much space, and achieves accurate partial copying. The purpose is to

"Means for Solving the Problems" The technical means of the present invention to achieve this objective are as follows.

This copying device scans and moves the original and an optical system relative to each other, projects the image of the original illuminated by light from a light source onto a photoreceptor through a slit, and copies it onto copy paper. be. It also has the following image indicating means and a liquid crystal panel.

The image instruction means appropriately indicates the front and rear ends of the projected image to be copied in the scanning direction.

The liquid crystal panel is provided over the entire area of the slit, and the light transmittance changes from light transmission to light blocking, and the light transmission is controlled based on a signal from the image instruction means in synchronization with the scanning movement between the front and rear ends of the image. It is light-shielded except for this light-transmitting side control portion.

1. Function" Since the copying apparatus according to the present invention is comprised of such means, it functions as follows.

The leading and trailing edges of the projected image to be copied in the scanning direction are appropriately designated by the image designating means.

Based on the signal from this image instruction means, the liquid crystal panel
Light transmission is controlled in synchronization with the scanning movement between the leading and trailing edges of the image to be copied. The portion other than the light transmission control portion is shielded from light.

Therefore, on the photoreceptor, portions other than the projected image or unnecessary portions of the image have clear boundaries and are reliably shuttered and light-blocked.

Therefore, in the negative/positive mode, even if the enlarged and projected image is smaller than the size of the fed copy paper, the formation of a black frame around the image on the copy paper is reliably prevented. Also, partial copies may have blurring, omissions, or omissions at the edges/boundaries.
This is done accurately without overcopying or the like.

Moreover, these do not take up much space and are simple -6= It is done easily and reliably.

"Example" The present invention will be described in detail below based on the example shown in the drawings.

First, the configuration etc. will be explained in the following order: the outline of the reader printer, the recording card, etc., the operation panel, the print position designating means 2 image designating means, the liquid crystal panel, etc.

An overview of a reader printer, which is an example of a copying device, is as follows.

FIG. 11 is a perspective view of its appearance, and FIG. 12 is a perspective view of its optical system.

Light from a light source 1 such as an exposure lamp is focused by a movable condenser lens 2 and a fixed condenser lens 3,
It passes through the microfilm 4, which is the manuscript, by irradiating it from below,
The projection lens 5 is reached. As a result, the image P on the microfilm 4 is enlarged and projected by the projection lens 5.

In the reader mode, the image P projected from the projection lens 5 is transmitted to the reader first mirror 6 at the reader position.
The image is then bent by a fixed leader second mirror 7 and is enlarged and projected onto a screen 8 placed at the upper front of the main body. During this time, the first print mirror 9 moves to the retracted position on the right side of the figure and assumes a folding posture, and the third print mirror 10 also moves to the retracted position at the front in the figure, retracting out of the leader optical path formed together. ing.

Next, in the print mode, first the reader first mirror 6 moves upward from the reader position and retreats out of the formed printer optical path. Print on behalf of the first mirror 9
The print third mirror 10 synchronizes with the above-mentioned retracted position and moves in reverse scanning to the left and rear scan start positions in the figure, respectively, and then moves from the respective scan start positions toward the right and front scan end positions. Scan and move. In this way, the image P from the projection lens 5 is transferred to the print first mirror 9
．． Fixed printed second mirror 11. Printed third mirror 10. The printed image is bent by a fixed fourth mirror 12 and projected onto the surface of a rotating drum-shaped photoreceptor 13 through a slit to be described later. Then, an image is formed by a known process and copied onto copy paper 14. That is, the image P is projected onto the charged photoreceptor 13 by slit projection exposure to form an electrostatic latent image, toner is attracted to this electrostatic latent image to develop it, and the image is fed from a paper feeder (not shown). The image is copied by transferring it to the printed copy paper 14.

In the illustrated example, the first print mirror 9 and the third print mirror
A method is used in which the mirror 10 scans and moves, that is, the optical system moves in a scanning manner.However, as is adopted in some electronic copying machines, on the contrary, the optical system is all fixed and the document is scanned. Of course, it is also possible to consider a method in which both sides move in a scanning manner.

In FIG. 11, 15 is a roll film carrier into which the microfilm 4 is loaded, 16 is a paper feeding power center for the copy paper 14, and 17 is a paper discharge tray after copying. Further, in FIG. 12, 18 is a first reflecting mirror arranged behind the light source 1, and 19 is a second reflecting mirror that bends the light upward.

The reader printer looks like this.

=9- Next, the recording card etc. will be explained.

This reader printer, which is a copying device, is managed by a system using a recording card. This record card records management information regarding the usage status of the reader printer, such as the total number of copies made, number of copies per size per date, user/department, number of service calls, copying fee, etc. In addition to the method of recording various items of management information, it is of course possible to perform this recording of only one type of item, such as the total number of copies.

A typical example of this recording card is a magnetic card 20 that records magnetically, but a microcomputer is used to
IC cards that record on AM and various other recording methods are conceivable. Reference numeral 21 in FIG. 11 is a card reading means 21 connected to the reader/printer. This card reading means 21 reads, for example, a loaded magnetic card 2.
Management information is read from 0 using a magnetic head.

The recording cards etc. are like this.

Next, the operation panel 22 will be explained.

FIG. 4 is a front view thereof.

The operation panel 22 is provided on the front side of the reader printer, and includes a zoom key 239, an image rotation key 24, a focus key 25 . Print key 26° Numeric keypad from "0" to "9" 27. Lamp key 28 for turning on and off light source 1
．． A clear key 29 is provided, and when each key is pressed, a predetermined coded signal is sent to a control means such as a microcomputer 31 via a boat 30 as shown in the block diagram of FIG. etc. will be done.

The operating panel 22 therefore primarily forms such a general operating means of the reader-printer.

The operation panel 22 also forms a second means for inputting character information regarding the image P.

That is, this operation panel 22 further includes a print sesoto key 3.
2 and a print display section 33 such as a liquid crystal type, a signal corresponding to the press of the print set key 32 is sent to the microcomputer 31, and a display signal is sent from the microcomputer 31 to the print display section 33 via a drive circuit 34. is output. Note that the textual information regarding the image P is additional information that is not present in the image P on the microfilm 4 that is the original manuscript, that is, information that is not projected on the screen 8.
Date 1 name, size, number of pages of image P.

Refers to users, departments, etc. Also, symbols other than pure letters.

It is also possible to use figures etc. as a medium.

By pressing the print set key 32, the lamp key 28 is first pressed.
The code is shifted from the key for turning on and off the light source 1 to the key representing a slash, that is, "/", and a display signal is output to the print display section 33. For example, by using the numeric keypad 27 and lamp key 28, r87/3/2
When 0J is pressed, the date will be displayed on the print display section 33. The clear key 29 is used for erasing and redoing as usual.

Note that the means for inputting character information regarding the image P is not limited to using the operation panel 22 of the main body of the reader printer, etc., but may also use, for example, a connected Mars controller, a personal computer, or the like. That is, for example, a Mars controller, which is an accessory device for automatic image search of the reader printer, may be used, and character information regarding the image P may be input using its operation panel in the same manner as described above. In this case, the nth
When copying from frame to nth frame plus m frame, 1/
It is possible to print the number of pages from m+1 to m+l/m+1, and it is also possible to provide an automatic page printing function.

Thirdly, the operation panel 22 also forms management information instruction means.

That is, management information regarding the usage status of the reader printer, which is a copying device, is read from the magnetic card 20 or the like by the card reading means 21 and sent to the microcomputer 31. Select items and make other additional inputs.

This is done, for example, on the condition that the magnetic card 20 is loaded into the card reading means 21 and the print set key 32 is pressed.
This is done by shifting the code of each key and sending out the corresponding signal.

For example, "1" to "9" on the numeric keypad 27 indicate the total number of copies, which is management information related to usage status.

It is used as a key to specify the number of copies per size, date, user/department, number of service calls, copying fee, etc. and either numeric keypad 2
By pressing 7, via the microcomputer 31 etc.
The management information corresponding to that number is selected, and the print display section 3
3, and will be printed on the copy paper 14 by the printing means as described later.

The slump key 28 is used as a composite key. For example, if you need the total number of copies by department,
After pressing the number key 27 corresponding to the department, the lamp key 28 is pressed, and then the number key 27 corresponding to the total number of copies is pressed. Moreover, "0" on the numeric keypad 27 is not the management information recorded on such a magnetic card 20, but the date, page number, etc. are displayed and printed as manual management information in accordance with the character information regarding the image P mentioned above. Used as a shift key when Regarding the number of copies by size, the number of copies of the selected copy paper 14 is added. That is, the number of copies recorded on the magnetic card 20 up to the previous time plus one copy, in other words, the number of copies including the current copy will be displayed and printed.

Note that, other than the example described above, it is also possible that only one type of management information is recorded on the magnetic card 20, so that there is no need to use the operation panel 22 as a management information instruction means.

The operation panel 22 looks like this.

Next, the print position designation means will be explained.

FIGS. 5 and 6 are front views thereof.

The print position designation means 35 designates the print position of the character information regarding the image P inputted by the operation panel 22, which is the manual means described above, to an appropriate location in the image P, for example, in the margin area around the image P. be.

That is, this print position designating means 35 is configured by the first X knob 36 . It has a second X knob 37, a first Y knob 38, and a second Y knob 39. These first and second X knobs 36
．． 37 and 1st. The second Y knobs 38 and 39 are guided by guide grooves 41 and 42 respectively formed in the screen frame 40 around the screen 8, and can be operated and moved linearly in the X direction and the Y direction, respectively. There is. And this 1st X knob 36. 2nd X Mami 37. 1st Y Mami 38
, the second Y knob 39 respectively correspond to the first X cursor 43 .
2nd X cursor 44. It is connected to the first Y cursor 45 and the second Y cursor 46 so that they work together. This first. 2nd X cursor 43.44 and 1st. The second Y cursors 45 and 46 are translucent linear cursors located opposite to each other on the rear side and the projection side of the screen 8, and are visible from the front side of the screen 8. 1st 1C-2X knob 36.37 and 1st. 2nd Y angle 38°39
It is possible to move in the X direction and the Y direction in conjunction with the .

Also, the first of these. 2nd X angle 36°37, 1st. Second
The Y knobs 38 and 39 are each connected to a potentiometer, and the movement position thereof is recognized and a corresponding signal is input to the microcomputer 31 via the A/D converter 47, as shown in the block diagram of FIG.

First, the first X cursor 43 and the first Y cursor 45 can be moved to the outside of the key frame 48 at the maximum size and outermost position among the key frames indicating the size and position of the image P on the screen 8. . Then, the first X cursor 43
By moving to the outside of the key frame 48 as shown in the figure, the image P is specified to be printed side by side in the Y direction and the vertical direction on the screen 8. Conversely, by moving the first Y cursor 45 to the outside of the key frame 48 as shown in FIG. 5, the image P is designated to be printed side by side in the X direction and the horizontal direction on the screen 8. Further, the second X cursor 44 and the first 17-2Y cursor 46 are in the X direction of printing, respectively.

It functions for specifying the position in the Y direction. And then the first one. The second x cursor 43.44 and the 1° second Y cursor 45.46 function to specify the width of printing in the X direction and the Y direction, respectively.

Further, along the guide grooves 41 and 42, scales of 49.degree. and 50.degree. are displayed in a line shape. On this scale 49°50, there is a 1st
x knob 36. 2nd X knob 37° 1st Y knob 38.
protrusions 36+ provided on the second Y knobs 39,
37+, 3L, and 39° are in corresponding positions. One division of the scale 49.degree. 50 is set to correspond to the size of one character of character information, management information, etc. to be displayed and printed as will be described later.

Since the printing position specifying means 35 is configured as shown below,
For example, it is used as shown in FIG.

First, if the character information regarding the image P input through the operation panel 22 serving as the input means is, for example, [87/3/20J], that fact is displayed on the print display section 33. The size and position of the image P on the screen 8 are shown by imaginary lines in the figure.

First, the first X cursor 43 is moved in the X direction to the outside of the key frame 48 using the first X knob 36 .

As a result, the image P is specified to be printed side by side in the Y direction and the vertical direction on the screen 8. Then the second
The second X cursor 44 is moved using the X knob 37, thereby specifying the position of printing in the X direction. Then the remaining 1st. The second Y knob 38.39 controls the first. By moving the second Y cursors 45 and 46, the width of the print in the Y direction is specified between the two. If the number of characters displayed on the print display section 33 is, for example, 7 characters, the width of the print is specified by the first . 2nd Y knob 38°39 protrusion 3B
,,39. This is done by setting the interval to seven characters with reference to the scale 50.

Such a first. 2nd X knobs 36, 37, 1st, 2nd
The positions of the Y knobs 38 and 39 are input to the microcomputer 31 via potentiometers, and a signal for specifying the print position is output to the liquid crystal panel, which will be described later.

In the figure, 51 is a display section for displaying the number of copies and the size of the copy paper 14, and 52 is a hiding panel.

Firstly, the printing position specifying means 35 is configured to specify the first printing position as shown in the figure. 2nd X knobs 36, 37, 1st. 2nd Y knob 38
, 39, 1st. 2nd X cursor 43.44, 1st. Second
The method is not limited to the method of specifying the print position using the Y cursor 45, 46, etc., and a method using, for example, an LED is also possible. That is, a large number of LEDs are lined up in the X direction and the Y direction on the screen frame 40, and by shifting the code of each key on the operation panel 22, the lighting location of the LEDs is moved and controlled, and the image P is changed by lighting the desired location. You may also specify the print position for.

Second, the printing position specifying means 35 is not limited to such a variable specifying method, but may also be a fixed specifying method in which a specific position is fixedly specified from the beginning.

Thirdly, this printing position designation means 35 prints the management information regarding the above-mentioned usage state, which is read by the card reading means 21 and selected by the operation panel 22 as management information instruction means, as will be described later. Of course, it can also be used for specifying a printing position when printing by means. When the print position designating means 35 is used only for such management information, the cursor and knob may be simplified as shown below, regardless of the illustrated example. For example, a Y cursor and its knob that can be moved in the Y direction, and an
It is also possible to provide a cursor and its knob, with the position of each knob being output via a potentiometer.

The print position designating means 35 is configured as described above.

Next, the image instruction means will be explained.

The image designating means appropriately designates the leading and trailing edges of the projected image P to be copied in the scanning direction and, in the illustrated example, both ends in the image width direction orthogonal thereto.

FIG. 7 is a side view showing an example of the optical sensor 53, etc.;
FIG. 8 is a front sectional view thereof, and FIG. 9 is an explanatory plan view thereof.

54 is a moving table, and this moving table 54
The mirror 9 is held via a holder 55 and guided by a scanning shaft 56 to move it in the scanning direction and in the reverse scanning direction shown by arrows in FIGS. 8 and 9. An optical sensor 53 such as a solid-state imaging device is fixed to the bottom surface of the front end of the moving table 54 in the reverse scanning direction. As shown in FIG. 9, this optical sensor 53 is set to be longer than the size in the image width direction of the largest image P' projected from the projection lens 5. Therefore, by moving the optical sensor 53 in the reverse scanning direction indicated by the arrow, the optical path from the projection lens 5 is sequentially cut, thereby making it possible to photometer the necessary amount of light over the entire surface of the projected image P.

Since the optical sensor 53 is configured as described above, in the case of the so-called negative-positive mode in which a positive image is copied from the microfilm 4 of the original negative image, the projected image P is detected at the leading and trailing ends to be copied in the scanning direction. In the illustrated example, the leading and trailing edges 57 and 57 of the image P itself, and both side edges to be copied in the image width direction orthogonal thereto, and both side edges 58 and 58 of the image P itself in the illustrated example are detected and indicated as follows.

That is, first, the size specifying means 59 (first
0), the size of the copy paper 14 to be fed is selected. The optical sensor 53 detects a length width W corresponding to the size of the copy paper 14 when the first print mirror 9 moves in reverse scanning to its scanning start position by pressing the print key 26 (see FIG. 4). Copy paper area 6o
Measure the amount of light. Then, in the image width direction, the light amount does not change, and the light amount changes to large areas a and a'.
A small range b, ranges c and c' where the amount of light does not change or are large in the scanning direction, and a range d where the amount of light changes or is small are detected. These ranges a and a' correspond to the margins between the opposite edges 58° 58 of the projected image P and the opposite edges of the copy paper area 60. Similarly, ranges c and c' are the leading and trailing edges 57 and 57 of the projected image P, and the copy paper area 60.
This corresponds to the margin between the front and rear ends of In this way,
The range extends from d to the area of image P, and both edges 58.
58 and the leading and trailing ends 57 and 57 are detected and indicated.

Note that the image indicating means is not limited to the method using such an optical sensor 53, but may also be a manual method using the above-described printing position specifying means 35, or other methods. That is, for example, 1st. 2nd X knob 36.37
and 1st. By operating the second Y knobs 38 and 39, the first.
2nd X cursor 43.44 and 1st. 2nd Y cursor 45
By placing .degree. 46 at each edge of the image P projected onto the screen 8, the front and rear edges 57,57 and both side edges 58,58 are easily indicated.

In the case of partial copying, a manual method using this printing position specifying means 35 is mainly adopted as the image specifying means, and each cursor 43, 44, This is done by placing 45°46.

The image indicating means is like this.

Next, the liquid crystal panel etc. will be explained.

FIG. 1 is a perspective view thereof, and FIGS. 2 and 3 are explanatory views of its operation, respectively.

The drum-shaped photoreceptor 13 is rotated, for example, in the counterclockwise direction as shown by the arrow, and this rotation is caused by the scanning movement of the first printing mirror 9 and the third printing mirror 10, that is, the projected image P is thereby rotated. It is synchronized with the scanning movement. A slit frame 6 is provided near the photoreceptor 13.
1 are located opposite to each other.

This slit frame 61 has a slit 6 formed therein.
A liquid crystal panel 63 is fitted over the entire area of 2.
' This liquid crystal panel 63 has a large number of partitioned transparent electrodes arranged in a dense matrix, each of which is addressed, and the light transmittance changes depending on the voltage applied to each transparent electrode. Each one changes from light-transmitting to light-blocking. Further, in this liquid crystal panel 63, a downstream end 64 of the image P in the arrow scanning direction is covered with a light shielding plate 65 having an internal space, and is always shielded from light from the optical path. This light shielding plate 6
A dedicated light source 66 such as a halogen lamp capable of uniformly irradiating the downstream end 64 of the liquid crystal panel 63 is provided in the internal space of the liquid crystal panel 63 .

First of all, as shown in FIG. 2, during scanning movement in the so-called negative/positive mode, the liquid crystal panel 63 displays an image of the projected image P based on a signal from the optical sensor 53, which is an image indicating means. Light transmission is controlled in synchronization with the scanning movement between the leading and trailing ends 57,57 at intervals corresponding to both ends 58,58 in the width direction, that is, in the entire range. The liquid crystal panel 63 is shielded from light except for this light transmission control portion.

That is, at the start of the scanning movement, the entire surface of the liquid crystal panel 63 is initially in a light-shielded state. Based on the signal related to the image P detected by the optical sensor 53, control is performed as shown in FIG. 2 (1), (2), and (3). First, when the front and rear ends 26-57 of the projected image P pass the upstream edge 67 of the liquid crystal panel 63, the liquid crystal panel 63 is unblocked as the image P moves downstream in the scanning direction. . Note that the width thereof is an interval corresponding to both side edges 58.58 of the image P. During the scanning movement of the image P, the liquid crystal panel 63 maintains the light-transmitting state, and the front and rear edges 5 of the image P
When the rear end of the image P passes the upstream edge 67, the image P is scanned toward the downstream side in the scanning direction, and light transmission is again canceled.

Note that partial copying also follows this method, and only necessary portions of the image P are controlled to transmit light, while unnecessary portions are blocked.

Secondly, as shown in FIG.
Based on the signal from the image P, character information regarding the image P is displayed at a predetermined position in synchronization with the scanning movement of the projected image P.

Thirdly, as shown in FIG. 3, this liquid crystal panel 63 displays management information regarding the usage status of the reader/printer etc. based on the signal from the card reading means 21, and displays the copy fed from the paper feed section. Display to be printed on paper 14.

That is, in this case, the liquid crystal panel 63 forms a printing means for printing management information on the copy paper 14 together with the photoreceptor 13 and the like.

Note that the means for printing such management information is the liquid crystal panel 63. It is not limited to the type using the photoreceptor 13, for example, a type device may be provided in the paper feed section of the copy paper 14, and various other types of devices such as a reader printer etc. that print predetermined management information on the copy paper 14 may be used. This method is possible.

Now, let's move on to the second point mentioned above. The details of the third liquid crystal panel 63 are as follows.

First of all, in PosiPosi mode, it is as follows. That is, in the mode of obtaining a copy of a positive image from the microfilm 4 of a positive image, the liquid crystal panel 63 in the slit 62
When the projected image P scans and moves, the operation panel 22, which is an input means, and the print position designation means 35. Card reading means 21. Control is performed as follows based on signals from the operation panel 22 or the like as management information instruction means. That is, characters 68 representing character information regarding the image P or management information regarding the state of use are displayed as light-shielding portions on the liquid crystal panel 63 at timings corresponding to predetermined positions.

As shown in FIG. 3 (1), (2), and (3), the characters 68 are continuously displayed moving downstream at the same speed as the scanning movement of the image P. . In this way, using the projection optical path of the image P, predetermined character information and management information are projected onto the photoreceptor 13 and printed on the copy paper 14.

Next, the negative/positive mode is as follows.

The light shielding plate 6 of the liquid crystal panel 63 is indicated by the broken line in FIG.
A downstream end portion 64 covered by 5 is always shielded from light, and the rest of the downstream end portion 64 is, in principle, transparent. When projecting and exposing the image P onto the photoreceptor 13, an operation panel 22 serving as an input means. Print position designation means 35. Control is performed as follows based on signals from the card reading means 21, the operation panel 22 as management information instruction means, and the like. That is, characters 68 representing predetermined character information or management information are displayed on a transparent portion of the downstream end 64 of the liquid crystal panel 63 at a timing corresponding to a predetermined position in synchronization with the circumferential speed of the photoreceptor 13 being rotated. is displayed, and the dedicated light source 66 is turned on during that time. In this way, the dedicated light source 6
6, predetermined character information and management information are transferred to the photoreceptor 13.
The image is projected and exposed and printed on the copy paper 14.

The liquid crystal panel 63 has this structure.

The above is the explanation of the configuration, etc.

Next, the operation etc. will be explained.

The operator of the reader printer searches for the image P on the microfilm 4, and also presses the zoom key 231, image rotation key 24, focus key 25, etc. on the operation panel 22 to perform necessary zooming, image rotation, focusing, etc. , the desired image P is accurately projected onto the screen 8.

Then, when the print key 26 is pressed, the image P
is ready to be copied immediately.

Now, prevention of the formation of a black frame around the image P on the copy paper 14 in the negative/positive mode and partial copying are performed as follows.

First, the image indicating means selects the front and rear ends of the projected image P to be copied in the scanning direction, the front and rear ends of the image P itself in the illustrated example, and the both ends of the image P that are to be copied in the image width direction. , in the illustrated example, both side edges 58.58 of the image P itself
is instructed. In the case of partial copying (not shown), for example, the edge/boundary between the necessary and unnecessary parts of the image P is designated by an image designating means using the printing position designating means 35, as described above.

In the illustrated example, when the print key 26 is pressed and the first print mirror 9 first performs reverse scanning movement toward the scanning start position, the image is projected by the optical sensor 53 provided on the moving stage 54. Detection of image P and instruction are being performed.

Thereafter, the first printing mirror 9 and the third printing mirror 10 are moved for scanning, and slit projection exposure of the image P is performed on the photoreceptor 13. This exposure starts and ends within the length L of the copy paper area 60.

Based on the signal from the optical sensor 53 serving as the image indicating means, the liquid crystal panel 63 displays the image at both ends 58.5 in the image width direction.
Light transmission is controlled in synchronization with the scanning movement between the front and rear ends 57 and 57 of the image P at intervals corresponding to 8, and light is blocked except for this light transmission controlled portion.

That is, at the start of the scanning movement, the entire surface of the liquid crystal panel 63 is initially in a light-shielded state.

Then, based on the signal regarding the image P that was instructed by the optical sensor 53 during the previous reverse scanning movement, the image P
When the front and rear ends 57 of the projected image P pass the upstream edge of the slit 62 on the upstream side in the scanning direction, that is, the upstream edge 67 of the liquid crystal panel 63, as shown in FIG. , the liquid crystal panel 63 is gradually unblocked as the image P moves downstream in the scanning direction. Note that the width thereof is an interval corresponding to both side edges 58.58 of the image P.

Next, as shown in FIG. 2 (2), while the image P is being scanned, that is, passing through the slit 62, the liquid crystal panel 63 maintains a light-transmitting state.

As shown in FIG. 2 (3), when the rear end of the front and rear edges 57 of the image P passes the upstream edge 67, the image P is scanned downstream and the liquid crystal panel 63 again stops transmitting light. It will be lifted.

In this way, the portion other than the light transmission control portion for the image P is reliably shuttered and light-blocked.

Therefore, even on the photoreceptor 13, the portion other than the projected image P is reliably shielded from light.

Therefore, even if the enlarged and projected image P is smaller than the size of the fed copy paper 14, the formation of a black frame around the image P on the copy paper 14 is reliably prevented. Moreover, these operations can be performed simply, easily, and reliably without taking up space due to the liquid crystal panel 63 or the like.

Similarly, in the case of partial copying (not shown), the liquid crystal panel 63 is controlled to transmit or block light by the image instruction means, so that blurring, omissions, and overlapping are caused at the edges and boundaries between the necessary and unnecessary parts of the image P to be copied. Accurate and clear partial copying is achieved without copying or the like.

The above is the explanation of the operation, etc.

=33- Furthermore, in the above-described example of black frame prevention and partial copying, the image indicating means and the liquid crystal panel 63 determine the leading and trailing edges of the image P in the scanning direction, for example, the leading and trailing edges 57, 57 of the image P itself, and Light shielding/shading control is performed on both ends in the image width direction perpendicular to this, for example, on both ends 58 and 58 of the image P itself. However, the present invention is not limited to such an example, and controls only the front and rear edges to be copied in the scanning direction, for example, the front and rear edges 57, 57, etc. of the image P itself, and does not control the side edges 58, 58, etc. It is also possible that there is no such case. That is, for example, the information recorded on the image P may be distinguishable only at the front and rear ends, and there may be no particular advantage in distinguishing the both ends.

"Effects of the Invention" As explained above, the copying apparatus according to the present invention saves space by providing a liquid crystal panel in the slit that is controlled to transmit light in synchronization with the scanning movement of the projected image. Moreover, the formation of a black frame around the image on copy paper can be easily and reliably prevented. In addition, partial copying of only the necessary portions of the image can be realized accurately and clearly. In other words, it does not take up much space, can be easily installed near the slit, is cost-effective, and does not require the precision of parts required for conventional single-type mechanical shutters.
From this point of view, it is excellent in terms of cost, and it also eliminates the unsightly appearance of black borders, excess toner consumption, and strain on the blade, and eliminates the problems that existed in conventional examples of this type. There is something great about it.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing essential parts of an embodiment of a copying apparatus according to the present invention. FIGS. 2 and 3 are explanatory diagrams of the operation. FIG. 2 shows a state in which the projected image is scanned and moved from Figure (1) through Figure (2) to Figure (3). Also, in Figure 3, character information and management information are transferred from (1) to (2) to (3) in positive mode.
) shows the state in which the screen is moved and displayed on the liquid crystal panel. -Go to 9- Fig. 4 is a front view of the operation panel. 5 and 6 are front views showing the printing position specifying means together with the screen. FIG. 5 shows the case of specifying in the X direction, and FIG. 6 shows the case of specifying with 6 trowels in the Y direction, respectively. It shows. Figures 7 and 8 are the printed first mirror. 7 is a side view thereof, and FIG. 8 is a front sectional view thereof. FIG. 9 is an explanatory plan view showing the relationship between the optical sensor and the projected image. FIG. 10 is a block diagram of the control means according to the embodiment. 11 and 12 show an example of a reader printer, with FIG. 11 being a perspective view of its external appearance, and FIG. 12 being a perspective view of its optical system. ■...Light source 4...Microfilm (original) 13...Photoreceptor 14...Copy paper 35...Print position designation means (image designation means) 53...
・Optical sensor (image indicating means) 57... Front and rear ends 62... Slit 63... Liquid crystal panel P... Figure/3°゛

Claims (1)

[Claims] A document and an optical system are scanned relative to each other, and an image of the document irradiated with light from a light source is projected and exposed onto a photoreceptor through a slit, thereby being copied onto copy paper. In the copying apparatus, an image indicating means for appropriately indicating the leading and trailing edges of the projected image to be copied in the scanning direction; Based on a signal from the means, the image is controlled to transmit light in synchronization with the scanning movement between the front and rear ends, and is characterized by comprising a liquid crystal panel that is shielded from light except for the light transmission control portion. Copying equipment.