JPS59177528A - Reader printer - Google Patents

Abstract

PURPOSE:To start exposing operation in a reader state in a short time and to obtain automatically a copy image with constant density regardless of picture density by exposing a photosensitive body to the picture of an original when a mirror which reciprocates along a straight line crossing an optical path of projection positions at the optical path. CONSTITUTION:Scanning mirrors 10 and 11 move in one body in a direction B' shown by an arrow, and when the mirror 10 enters the optical path of projection of a lens 5, the moving photosensitive drum 12 is exposed to a picture of a film. A lamp 2 is controlled by a lamp driving circuit 34 for a printer during the exposure and adjusted to the quantity of light emission corresponding to picture density stored in a storage circuit 38. Consequently, the photosensitive drum is exposed properly to the picture density and a copy image of good quality is obtained. When the exposing operation is completed, and exposure end signal is sent from the output terminal 32a of a printer control circuit 32 to disconnect the lamp driving circuit 34 for the printer from the lamp 2 by a switching circuit 35 in response to said end signal, thereby connecting a lamp driving circuit 33 for a reader to the lamp 2. When the mirrors 10 and 11 return to their initial positions, the device enters the original reader state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reader printer that can be switched between a reader state in which an image of an original such as a document or film is projected onto a screen, and a printer state in which the image is projected onto a photoreceptor.

When copying an image from a document such as microfilm using a conventional reader printer, the magnification of the lens used, the material of the document, the density of the document image, and the power supply voltage level and
Since the proper exposure acid changes due to fluctuations, there is a drawback that it is difficult to obtain a proper copy image in one operation. In order to eliminate these drawbacks, while the image on the film is being exposed to the photoreceptor, the density of the image is detected by receiving the light from the image with a light receiving element, and the exposure time or exposure time is adjusted according to the detected density. There is a known method for automatically obtaining an appropriate copy image by controlling the amount of light from a lamp. However, this method uses a reader printer 11C that uses a so-called stationary full-surface simultaneous exposure method that performs exposure while keeping the document, photoreceptor, and optical system stationary.
However, it cannot be applied to a reader printer that copies by moving the original or the optical system using a slit exposure method. In a slit B light type reader printer, before performing exposure scanning for copying, the scanning system (original or optical system) is moved to pre-scan the document surface.
During this preliminary scanning, the light from the document is received by a light receiving element to detect the density of one image, and after the preliminary scanning path r, an exposure scan is performed.
During exposure scanning, the amount of light from the exposure lamp is controlled based on the detected density. For this reason, since the scanning system is moved back and forth in the preliminary scanning process, there is a drawback that it takes time to switch from the reader state to the printer state and start the IM light operation. Furthermore, conventionally, when switching from the reader state to the printer state, a mirror is rotated to switch the projection optical path, which has the disadvantage that it takes more time to start exposure.

The purpose of the present invention is to eliminate the upper rudder defect, start the exposure operation in a short time from the leader state, and maintain a constant m
An object of the present invention is to provide a reader printer that can automatically obtain a duplicate image.

The present invention will be explained below using specific examples shown in the drawings. FIG. 1 shows a reader printer to which the present invention is applied, in which a document such as a microfilm 1 is illuminated by an illumination device comprising an illumination lamp 2, a spherical reflector 3, and a condenser lens 4.

The entire 1+111 image of one frame of the microfilm 1 is simultaneously projected onto a screen 8 via an imaging lens 5 and fixed mirrors (reflection members) 6 and 7 placed in a -bo device.

1o-it is a set mirror that exposes and scans the image of the microfilm 1 on the image recording photosensitive drum 12 rotating in the direction indicated by the arrow, and both mirrors have an angle of 901 degrees. The scanning mirror lo.11 is fixedly supported by a support 13, which is connected to a driving source, and is moved together with the scanning mirror 1.degree. 13. It is moved back and forth in the 13' direction. The moving speed of the scanning mirror 10-11 is selected to be % of the circumferential speed of the photosensitive drum 12.

The scanning mirrors lO and lJ scan a slit-shaped part of the entire image of one frame on the microfilm onto the photosensitive drum 1.
By the movement of the support 13, the scanning mirror IO. At the same time, the scanning mirrors 10 and 11 are moved in the direction perpendicular to the optical axis, so that the entire 1-frame image to be copied is sequentially fixed and exposed onto the photosensitive drum 12 in the form of strips. It is placed at the position shown in FIG. 1 (hereinafter, this position will be referred to as the initial position). A window 2o is provided on the support 13 so as not to obstruct the optical path of the imaging lens 5, and when the scanning mirror 1O is located at the initial position outside the optical path of the imaging lens 5,
The image of the microfilm l illuminated by the lamp 2 passes through the lens 5, the window 20, and is projected onto the screen 8 via the fixed mirrors 6 and 7.
1 image can be observed.

The support body 13 has detected members 15a and 15b at predetermined positions.
・15C and 15d are arranged, and each detected member is arranged in the direction of movement of the support 13, and is installed at a position corresponding to the size of the copy paper.

A photo ink blocker 16 for detecting a scanning (exposure) start position and a photo interrupter 17 for detecting a leader position are still arranged along the movement path of the detected member, and the detected member passes through the detection position of each photo interrupter. When a pulse signal is output from the photo ink club.

- When the photo ink printer 17 is detecting the detected member 15d, the mirrors 10 and 11 are in the initial position (the state shown in FIG. 1), and at this time, the image of the film is projected onto the screen 8, and the image can be viewed. can do. In this embodiment, three different sizes of copy paper are used, but if the size of the copy paper increases to four, the number of members to be detected is increased, and this member to be detected is placed at a predetermined position on the support 7. - Just attach it to -.

The detected member 15a positions the support (that is, mirrors 10 and 11) at an exposure start position corresponding to A-size copy paper, and the detected member 15b positions the mirror 10- at an exposure start position corresponding to B-size copy paper. 1.1, and the detected member 15c is used to position the mirror IO.11 at the exposure start position corresponding to C size copy paper. Copy sheets of A, B, and C sizes have sizes in which the length in the sheet feeding direction decreases in this order. FIG. 4 shows a block diagram of the exposure control circuit of the reader printer. 30 is a print switch, and 31 is a delay circuit, for example, a timer, which is activated when the print switch 30 is operated, and outputs a signal from the output terminal 31a after a predetermined period of time has elapsed. 3:l;t Printer control circuit, 33 is a reader lamp drive circuit, 34' is a printer lamp drive circuit, and 35 is a switching circuit. The switching circuit 35 selectively switches either one of the lamp drive circuits 33 or 34 to be connected to the lamp 2. In the reader state, the lamp drive circuit 33 and the lamp 2 are connected, and in the printer state, the lamp drive circuit 33 and the lamp 2 are connected. Connect lamp 2. Further, the switching circuit 35 is connected to the delay circuit 21. Switching is controlled by a signal output from the printer control circuit 32. 36 is a light receiving element that receives light from the film in order to detect the image density of the film. The light receiving element 36 is composed of a phototransistor, a photodiode, etc.
In the figure, it is placed at a position to receive light from the image area of the film reflected by mirror 7. The arrangement position of the light-receiving element is not limited to the example.
It is placed at any position where light from the Iil image area can be detected. 37 is an amplifier circuit, and 38 is a storage circuit for storing the output signal of the light receiving element 26. When the print switch 30 is operated, the output signal of the light receiving element 36 is stored after the stored contents are erased. When the film image (the entire image or a part of the image) is projected onto the screen 8, the light receiving element 36
That is, when in the reader state, it receives light from the original and outputs a heavy pressure signal corresponding to the amount of light received, that is, the image density, and this voltage signal is stored in the primary circuit 38 when the print switch 30 is operated. . The printer lamp drive circuit 34 controls the power supplied to the lamp 2 based on the pressure signal stored in the memory circuit 38, and thereby adjusts the amount of light emitted from the lamp so that an appropriate copy image can be obtained. Controlled 0 Next, the operation of the above device will be explained. The IJ-printer is in the reader mode, the reader lamp drive circuit 33 is connected to the lamp 2 by the switching circuit 35, and the lamp drive circuit 33 lights up the lamp 2 at a predetermined brightness. The image on the film illuminated with light is projected onto a screen 8.

Next, when copying this image, the print switch 30 is operated. When the print switch 30 is operated, the delay circuit 31 is activated, the leader state is maintained for the time set by the delay circuit 31, and the lamp 2 continues to be lit. On the other hand, when the print switch 30 is operated, the output signal of the light receiving element 36 is stored in the storage circuit 38. Therefore, when the print switch 30 is operated, the memory circuit 38 stores the output signal of the light receiving element 36 which receives light from the film, that is, the image density I. The setting time of the zero delay circuit 31 is 1σ.
11 The time required to measure the image density and memorize it is sufficient, which is a very short time. After the set time has elapsed, a mode switching signal is output from the output terminal 3 ], a of the delay circuit 31, and this signal causes the switching circuit 35 to disconnect the reader lamp and ringing circuit 33 from the lamp 2, and switch the printer lamp 1 drive circuit. Connect 34 to lamp 2. At the same time, the printer control circuit 32 is activated by a signal output from the output terminal 31a of the delay circuit 31, and each driving section of the printer is activated by the printer control circuit 32. When the mirror IO is in the projection optical path of the lens 5, the image on the film is moving], 2iC is exposed to the o FA"fr front-lighting lamp 2&-i.

It is controlled by a printer lamp drive circuit 34, and the luminescence intensity is adjusted according to the 1lIIIl image density stored in the storage circuit 38. As a result, appropriate exposure is performed according to the image density of the photosensitive drum V, and a high-quality copy image can be obtained. When the exposure operation is completed, an exposure end signal is output from the output terminal 32a of the printer control circuit 32.
In response to this signal, the cutting circuit 35 disconnects the printer lamp 1 drive circuit 34 from the lamp 2 and connects the reader lamp drive circuit 33 to the lamp 2. Mirror 10/11
When returns to its initial position, it returns to its original leader state.

FIG. 5 shows an example of the flinter system (iI-11 circuit 3201), in which the output signals of the photo interrupters 16 and 17 and the paper size detector 56 are transferred to the level converters 60, 61, and 6.
The output signals of each level conversion circuit 60, 61, and 62 are sent to a CPU (central processing unit) 64 via an i10 port 63. CPTJ64 is level variable circuit 5
I1 based on the signals sent from 9, 60, 61, and 62
A control signal is sent to the copying process control circuit 65 via the 0 port 63, and this control signal causes the process control circuit 65 to
Clutches C1 and C2 support the driving force of the motor M through which the drive of the copying section such as the stop and reverse clutch CI'' C2, the exposure device, and the charger is controlled by the motor M1 that drives the support plate 13 and the photosensitive drum 12. When the forward clutch C1 is turned on, the support body 13 moves in the direction of arrow B', and when the reverse clutch C7 is turned on, the support body 13 moves in the direction of arrow B.

FIG. 1 shows the reader mode in which the scanning mirrors 10 and 11 are placed in the initial position. In this reader mode, after observing the image on the screen and positioning the image to be copied in the print frame on the screen, When the print switch is turned on, the motor M is driven by a signal output from the delay circuit 31 after a predetermined time, and the normal rotation clutch C1 is turned on, so that the support body 13 starts moving at a constant speed in the direction B'. By moving in the direction of the support 130B', the mirror IO.11 is displaced from its initial position, the optical path of the imaging lens 50 is blocked by the support 13 due to the bulge, and the scanning mirror 10 is positioned within the optical path.

On the other hand, a code signal corresponding to the paper size is sent from the paper size detector 56 to the CPU 64, and the CPU 64 issues an exposure start signal when the count value of the counter reaches a count value corresponding to the code signal. In this example, the CPU 64 outputs an exposure start signal when the tll front count value becomes "1" when A size copy paper is used, and when B size copy paper is used. outputs a light-punching start signal when the count value reaches ``2'', and outputs a % light opening signal when the count value reaches ``3'' when C size copy paper is used. When the support plate 13 moves in the B' direction 1, the photointerrupter 16 detects the detected member 15a-]-5b・1
5c is sequentially detected, and as a result, the photo interrupter 16
From this, the pulse signal g shown in FIG. 6 is generated. This pulse signal 1r is level-converted by a level conversion circuit 60 and C
It is sent to the CPU 64 and counted by the counting section of the CPU 64. CP (J64 performs 61 number operations at the rising edge of the pulse signal. When copying using C size copy paper,
As shown in FIG. 2, when the mirrors 10 and 11 are placed at the exposure start position where the tips of both images to be copied are exposed to the photosensitive drum 12, the photointerrupter 16 activates the detected member 1.5.
Spy C. Therefore, when the state shown in FIG. 2 is reached, the count value of the counter becomes "3", and an exposure start signal is output at this time. This signal opens a shutter (not shown) on the optical path for the printer, and one image of the film 1 is slit exposed onto the photosensitive drum 12 rotating in the direction of the arrow, and the slit exposure is completed in the state shown in FIG. At this time, the mirrors 10 and 11 are at the exposure end position. Photosensitive drum 12
Around the image forming means such as a charger, a developing device, a transfer device, a cleaner, etc., which are not shown and are known in the art, are arranged, and copying is performed by electrophotography. After the exposure of the image is completed, the reverse clutch C2 is turned on and the mirror 10-11 moves in the direction B. When the photo interrupter 17 detects the sensing member 15d, the reverse clutch C2 is turned off and the mirror 10-11 is moved in the direction B.
11 is placed in the position shown in FIG. 1 and turned into a leader state. When making multiple copies of the same image, mirror 1
0.11 is 11! It moves back and forth between the expected start position and the exposure end position as many times as necessary. In addition, the mirror 100 is installed at a position as close as possible to the exposure start position without a support blocking the optical path, thereby further shortening the time until exposure starts when changed to printer mode. I can do it. Note that while the mirror 10 is moved from the initial position to the exposure start position, the image density is detected by the light receiving element 36, and if it is possible to store it in the memory circuit, when the print switch 30 is operated. It is also possible to operate the printer handle 11 output rotation power 32 and start moving the mirrors 10 and 11 when the print switch is operated. In this case, the time until the start of printing, that is, the time from the time when the print switch is operated until the exposure of the 1IIIi image on the photosensitive drum is started, can be shortened to (2).

In the above embodiment, the light i from the illumination lamp is controlled, but the aperture or slit width may also be controlled.

As described above, according to the present invention, when copying by slit exposure, the exposure operation can be started in a short time (■j) from the reader state, and the exposure amount can be automatically controlled according to the image density. By doing this, it is possible to always obtain a copy image with an appropriate density.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a linear printer showing one embodiment of the present invention, FIGS. 2 and 3 are diagrams explaining the movement state of the scanning mirror, and FIG. 4 is an exposure amount 1.4 circuit. Figure 5 is a block diagram of the printer control circuit, Figure 7 is a block diagram of the printer control circuit.
The figure is an output waveform diagram of the photointerrupter. 2... Lamp, 6, 7, 10, 11... Mirror 8.
- Screen, 12... Photosensitive drum, 36... Light receiving element.

Claims (2)

[Claims] (1) In a reader printer capable of switching between a reader state in which an image of a document is projected onto a screen and a printer state in which an image is projected onto a photoreceptor, a holding means for holding the device in a reader state for a predetermined period of time when a print command is issued; a recording/ordering means for detecting the amount of light from the document when the device is in the reader state for a predetermined period of time and storing a value corresponding to the amount of light; A reader printer comprising: a scanning optical means for performing syslit exposure using the optical means; and a control means for controlling an exposure end based on a value stored in the storage means when performing syslit exposure using the optical means. (2) The optical means has a mirror that can be taken in and out of the projection optical path, and means that moves the mirror back and forth along a straight line that crosses the optical path, and when the mirror is located in the nuclear optical path, the image of the original is A reader printer according to claim 1, characterized in that a photoreceptor is exposed to light.