JPS6049351A - Image output device - Google Patents

Abstract

PURPOSE:To check picture quality automatically and to obtain an excellent copy by comparing the integral value of an original image based upon the output of a readout sensor provided on an image formation surface with the integral value of an output image based upon the output of a readout sensor provided near a paper discharge part, and adjusting the picture quality. CONSTITUTION:Part of reflected light from an original 2 is inputted to the 1st readout sensor S1 through a half-mirror 14. The readout output of the 1st readout sensor S1 is inputted to a counter 203, which starts counting at a set value alpha and continues to count until a read of the original is completed, holding a counted value alpha+u lastly. When reflected light from a copy A is inputted to the 2nd readout sensor S2, its readout output is inputted to the counter 203, which starts counting down at the counted value alpha+u and continues to count down until the copy A is read completely; and the difference between the final value beta in the ending of the counting operation and set value alpha is reduced as mush as possible and the picture quality is so adjusted at to obtain an excellent copy.

Description

[Detailed description of the invention] The present invention relates to an image output device.

When attaching a sorter to a copying machine and copying originals one after another, when automatically sending multiple sheets of originals using a document feeder, and when printing original images by digitally processing them and copying them one after another.
When a copying machine is equipped with a sorter and documents are inputted one after another, it is extremely difficult to check the image quality of each individual output. Furthermore, if a copy is output after being 7 ace-towned, it is difficult to check the copy even without a sorter.

Therefore, in the above-mentioned image output apparatus, there has been a demand for an image output apparatus that can automatically check the copy image quality and obtain good copies.

The present invention meets the above-mentioned needs, and calculates the integrated value of the original image based on the output of the first reading sensor installed from the exposure optical system on the imaging surface of the optical system, and The integrated value of the output image is calculated based on the output of the second reading sensor provided in the document image, and the image quality is adjusted by comparing the integrated value of the original image and the calculated value of the output image. .

An embodiment of the present invention will be described above with reference to the drawings.

FIG. 1 shows an embodiment in which the present invention is applied to an electrostatographic copying machine. In the figure, reference numeral 1 denotes a document table for moving the original fA2 in the horizontal direction as indicated by the arrow.

Reference numeral 10 denotes an exposure optical system provided below the document table 1, which is composed of a light source 11, a reflecting mirror 12, a lens 13, a half mirror 14, etc., and the light reflected by the half mirror 14 is directed to the photoreceptor 3.
It is configured to reach the exposure section 31 of 0 and form an electrostatic latent image.

Reference numeral 20 denotes an optical system branched from the exposure optical system 10, which includes a lens 21 for forming an image of the light that has passed through the half mirror 14, and a CCD, for example, provided on the image forming surface of this lens 21.
(Charge Coupled Device,
= charge-coupled device). This first reading sensor +JSx detects image dots, which are images on the document 2.

The photoreceptor 30 is assumed to rotate in the direction of the arrow, for example, and a &'i Teidenso fli 40 is provided on the front-process side of the exposure section 31, and a developing device 50 is provided on the post-process side.

41 is a charging power source, and 51 is a bias power source.

Reference numeral 60 denotes a transfer device, which transfers the toner image on the photoreceptor 30 onto the transfer paper 71 when the transfer paper 71 conveyed from the paper feeder 70 in synchronization with the photoreceptor 30 reaches the transfer position; is a cleaning device for scraping off toner remaining on the photoreceptor 30 after transfer. Each of these packages N40, 50, 60, and 80 is arranged around the photoreceptor 30.

90 is a fixing device, and the toner image transferred onto the transfer paper by the transfer device 60 is transferred to this device! The image is fixed by the image forming apparatus 90 and sent to the paper discharge section 100. Near the paper discharge section 1oo,
First reading sensor S1 that detects image dots of cohey A
A second reading sensor S2 consisting of a CCD similar to the above is provided. 101 is a light source, and 102 is a lens.

FIG. 2 is a plotter diagram showing an example of the configuration of a control circuit for an electrostatographic copying machine configured as described above.

201 and 202 are first reading sensors, respectively.
l, a first driver that drives the second reading sensor S2;
In the second driver, each of these tribars 201 and 202 is a switching circuit 2 which receives an input of an external timing signal P, such as a conveyance yarn switch, and outputs either of the outputs Ql and Q2.
Controlled by 00.

Reference numeral 203 denotes a counter, for example, an after-run counter, and the clock switching circuit 2o4 and the mode switching circuit 205 perform switching control between count up and count down.

206 is a reset switch for setting the initial value of the counter 203. 207 is a D/A converter,
208 is a buffer.

Next, the operation when a manuscript is manually written will be explained.

■ Counter 203 using brisset switcher 206
Enter the set value α into . For example, when making an A4 size copy, the number is set to 1 million hits.

■ When the i-document 2 is set on the document table 1 and the exposure of the document 2 is started, the switching circuit 20 is activated by the external timing signal P.
The output Q1 of 0 becomes active 1 (the first driver 201 drives the first reading sensor +tSt. ) path 205 is switched to up count 7-1.

■ As the document table 1 moves, the reflected light from the document 2 passes through the total light optical system 10 and forms an electrostatic latent image on the exposed portion 31 of the photoreceptor 30, while the light that passes through the half mirror 14 is input to the first reading sensor S1 provided on the image formation (I) of the optical system 2o branched from the fog light optical system IO.

The reading output of the first reading sensor IIIS1 is inputted to the counter 203 as a 7-count clock, and this counter 203 starts counting up from the fixed value α and continues counting until the document reading is completed. Finally, the effective dot value α+u (u is the value obtained by calculating the number of dots in the original image) is held. The electrostatic latent image written in ncJ is developed by the developing device 5o, then transferred to the transfer paper 71 by the transfer device 60, and further fixed by the fixing device 90 to form cohesive A, which is transferred to the paper discharge section 1o ( ) and output onto the paper discharge tray 103.

(When 1 cohi A reaches the predetermined position of the paper discharge section 1oo, the external timing signal P causes the switching circuit 200 to
tive (the output Ql returns), and the second reading sensor s2 is driven by the second driver 202.

At the same time, the clock switching time m204 is determined by the output voltage.
, the mode switching path 205 is switched to town mode and mode mode.

(!?・The reflected light from copy A is sent to the second reading sensor S.
2, the read output of this sensor S2 is manually input to the counter 203 as a town count clock.
This counter 203 starts the town count υ from the count value α+U and continues counting until the end of copy A reading Jy.

(2) Here, if Cohi A is used or is properly copied, the final value β at the end of the town count should be the same value as the set value α of 9.

- If the final value β at the end of the town count is not equal to the set value α, the final value β is D/A converted to the D/A converter 207, and then sent as a control command via the buffer 208. emits q.

According to this control command q, the bias voltage of the developing device [50, the voltage of the charging device 40; The image quality W1 is adjusted so that good coherence can be obtained.

Note that it is ideal for the final value β and the set value α to completely match, so a certain tolerance range may be provided and a control command may be issued when the range is exceeded.

Further, in the above example, an uptown counter is used as the counter 2 (13), but the first and second reading sensors 8
1. In S2, hit Yu and Kawa's counters respectively, and these]
The phase number results of the J counter may be compared.

Furthermore, when CC1) is used as a reading sensor, its output value may take a medium mJ value, so it is desirable to set the threshold for black and white discrimination of images in advance using the drivers 201 and 202. .

In the dual embodiment, the first reading sensor JS1 is installed in the optical system 20 branched from the exposure optical system, but it is also possible to provide an optical system exclusively for the first reading sensor S1. Good things must be done.

As described in detail above, "YA" is based on the output of the first reading section provided on the image forming surface of the optical system from the L-point optical system in an image output device such as an electrostatic copying machine. On the other hand, determine the output value based on the output of the second reading sensor installed near the paper ejection section, and compare these two summed values to adjust the image quality. This allows you to automatically change the copy image quality.
Therefore, you can always enjoy high quality coffee.

[Brief explanation of drawings]

FIG. J is a side view showing an example of Kinoekamo Kazumi EtlI, and FIG. 2 is a block diagram showing an example of the control circuit. 1()... Organs C optical system, 100... Strap removal part, sl
...first reading sensor, S2...second reading center.

Claims (1)

[Claims] The integrated value of the document image is calculated from the exposure optical system based on the output of the first reading sensor provided on the image forming surface of the optical system, and the integrated value of the document image is calculated based on the output of the second reading sensor provided near the paper ejection section. An image output device characterized in that the output image integrated value is calculated by comparing the original image integrated value and the output image integrated value to perform image quality adjustment.