JPS60114884A - Picture processing device - Google Patents

Abstract

PURPOSE:To always attain a proper picture density by providing the second density adjusting means to prevent the variance of adjustment range of the first density adjusting means. CONSTITUTION:At the time when an operator depresses a copy start key 201, a copy density correcting lever 208 is set, and a DC bias value can be changed between about -200V and -450V with a line I2 as the reference in accordance with movement of a copy density lever 207. If the picture density of a finished copy is thinner than the normal value because of the surface state of a photosensitive drum and variance of the voltage of a lamp for original exposure and this density is thinner than a desired density though the copy density lever 207 is set to F9, the copy density correcting lever 208 is moved in the direction of F9 to raise the bias value, and thus pictures of a desired density are attained. If the picture density is thick abnormally, the copy density correcting lever 208 is moved in the direction of F1 oppositely to the above, and pictures of a desired density are attained similarly.

Description

[Detailed Description of the Invention] [Field of Commercial Use] The present invention provides an image correction system that can correct the FA adjustment range of a density adjustment means even if the sensitivity of a photoreceptor changes. This relates to processing equipment.

[Prior art and its problems]

Photoconductors used in image processing devices undergo changes in their characteristics due to long-term irradiation with light. As a means of absorbing changes in body characteristics, conventional methods have been used to detect the sensitivity of the photoreceptor and control the amount of light, high voltage, etc., but all of these methods have complicated configurations and are expensive (increase). There was a drawback.

[Purpose of the invention]

This invention was made to eliminate the above-mentioned drawbacks, and in addition to the density adjustment means provided in the conventional image processing apparatus, the 20th ar! L adjustment means is provided to correct changes in characteristics of the photoreceptor. The purpose of the present invention is to provide an image processing device of C5.

This invention will be explained below.

〔Example〕

FIG. 1 is a schematic cross-sectional view showing an embodiment of the image processing and apparatus according to the present invention, FIG. 2 is a front view of the operation panel, and FIG.
The diagram is the same (control circuit diagram).

In FIG. 1, 101 is the main body, 102 is a document platen cover, 103 is an operation unit and document table, 104 is a lamp for exposing the document, 105a to 105d are reflection mirrors, 106 is a zoom lens for variable magnification, and 101 is for heat exhaust. fan, 108 is a photosensitive drum, 109 & machine cleaner, 110 is a charger, 11
1 is a blank exposure lamp, 112 is a developing device, 113 is a paper feed cassette, 114 is a transfer charger, 115 is a transfer roller, 116 is a transport roller, 117 is a fixing device, 118 is a cobyton, 119 is an image edge sensor, 120 is Regis) p-
121 is a light receiving sensor, and 122 is a power switch. The copying process of this copying machine is not much different from that of conventional machines, so the details will be omitted.

In the operation panel shown in Fig. 2, 201 is a copy start key, 202 is a clear/stop key, 203 is a numeric keypad for setting the number of copies, and 204 is a copy machine status such as jam, paper out, toner replenishment, load counter check, etc. 205 is an indicator that doubles the number of copies and displays an error, 206 is an automatic/manual copy density adjustment switch key, 207 is a copy density lever (first density adjustment means), and 208 is the copy number A copy density correction lever (second density adjustment means) 209 for correcting the appropriate position of the density lever 207 is a same-size copy mode key, which is used to select a desired magnification mode. Reference numeral 210 is a variable size copy mode selection key, and 211 is a copy magnification display key. When pressed, the lower two digits of the selected magnification are displayed on the display 205. 21
2 to 215 are fixed copy magnification mode indicators, and 216 is a stepless copy magnification mode indicator. By repeatedly pressing the variable size copy mode selection key 210, that is, depending on the press, the display changes from 212 to 213, 214, 215, 216.
By switching to , the desired magnification Morton can be selected. Note that the variable size copy mode selection key 210 may be provided with an auto-repeat function so that the display changes while being pressed.

Reference numeral 217 denotes a stepless magnification lever, and when the stepless magnification lever is operated, an arbitrary magnification can be set using the stepless magnification lever 211. Note that the magnification range is 65 to 142%. 218 is a magnification scale, which corresponds to the position of the stepless magnification lever 21T. 219 is a main/wait indicator, which blinks during wait and lights up during standby. 220 is an automatic density adjustment mode indicator, and 221 is a manual density adjustment mode indicator.

In the third @ control circuit diagram, 301, 302° 303
is a one-chip microphone-computer (hereinafter referred to as MP)
, MP301, and 302 are controlled by the C controller. In particular, the MP301 performs signal processing such as manual operation of keys on the operating section, and the MP302 performs sequence control of the copying machine. Controls the MP303GXDC motor. PAO in each MP.

PA 1. ... is an input or output port, RE
SET represents a reset terminal, and lNTl represents an interrupt input terminal.

Next, the signals input to or output from each boat will be briefly explained. ZCR +:+ detection (No. 8, M
R6T is the main heater reset control signal, HTI is the main heater control signal, HT2 is the sub-heater control signal, B5
1i Density adjustment output signal for controlling the developing bias, SS
E is the sorter set signal, SST is the sorter switch number, DTP is the original tQ tip detection number, PP is the outer paper presence/absence detection signal, LP is the exposure lamp phase control signal, TH is the heater thermistor temperature detection number 43, LMON is the exposure lamp monitor signal, TREST is the toner presence/absence detection signal, and DNA
E is a copy original density detection signal, DNVRI.

DNVR2 has manual copy density Reno-201.
゜Copy dark)! if @The signal indicating the status of the correct bar 20B, DNZM is the signal indicating the status of the stepless variable magnification lever, K
EY is a signal indicating the state of the key during manual or mechanical adjustment, D
SP is No. 4g to the display, ■TN is the power supply for detecting remaining toner, MP 302 (7) ZMHP&! Zoom L/7Z home position detection signal, DS C11J is paper discharge jam detection signal, 5PRJ is separation jam detection number, HP is platen home position detection (K number, STJ is sorter jam detection signal, ZMI, 2M2 413 indicates the position of the zoom lens, CNT is the number of sheets counter signal, 0PBR is the signal to stop the return of the optical system (original table), and HTSH is the heater abnormality (1) ON /
OFF fii! The signal input to the disconnection t mesori of the TRIMINi1 thermistor, BL is the blank exposure control signal, and 0PBF is the forward or backward direction of the optical system!
The instruction signal, 0PCL, is ON10F for moving the optical system.
F system # signal, REG is Regis) G--RA control signal, F
DP is a paper feed timing control signal, MMSYC is a signal that synchronizes with the main motor and controls the fan, static elimination of the separation belt part, and pre-exposure control, SQL is a lower stage paper feed solenoid control signal, BSCL is a developing bias 0N10FF control number, H
VT is the main voltage voltage control signal, DCK is the drum 7μtsuk, T
HM OUT outputs the thermistor disconnection from the memory (M number, TCNT is the talk counter abnormality detection signal) tEGADJ is the rest timing W~1 8, LAL is the LED error control signal, 0PI of MP303
JN is the optical system drive motor, flake, forward, backward, 0
N10FF control abnormality diagnosis (if-number, FS is the magnification reference frequency, MCUT is the motor abnormality stop signal, OP
M is puff 1 described below. Optical motor control reference signal for creating speed control No. 46 FV, DRM is drive motor control signal, FV is one foot width pulse speed control signal, PC is phase control signal, OPMON is optical motor control monitor No. 41, FG
is the optical motor encoder signal, LCKP is the lock phase display signal, OFF is the optical motor filter switching number, R8
Tl~3 are reset signals for MP301~303 respectively, SI is serial communication input, SO is serial communication output,
SCK is a serial communication clock, 5PER is a serial communication enable signal, and SRDY is a serial communication acceptance signal. In addition, CLKI~3 is MP301~303, respectively.
0 reference clock.

Next, density adjustment will be explained.

FIG. 4 is a characteristic waveform diagram showing the allowable range of the density bias value by the copy density lever 207 and the copy density correction lever 208'. The density lever 207 shows the density bias value Y, and the left vertical axis is DC.
The bias values are generous, 11 represents the bias straight line of the reference density, 2 represents the bias straight line lower than the bias of the reference density, and I3 represents the bias plane 1IJY higher than the bias of the reference density. Nao, F, ~F, represents the amount of movement of the brightness lever zor or the copy density correction lever 20B, and F is the center point. The operation will be explained below.

The MP on the DC controller serves as the operation unit and document table 103.
copy speed lever 207 and copy density correction lever 20
From the input value set by 8 and the voltage novel DC
DC bias with bias control signal! Control. The copy density lever 201 can change the DC bias value of 250V and the copy density correction lever 208 can change the DC bias value of 300V, so DC bias 1& is -50 to -6.
Varies between 00V and 00V.

However, the operator actually pressed the copy start key 20.
At the time when 1 is pressed, the copy density correction lever 208 is at F.
, and the DC bias 1 "1 is used as the standard for direct spinning I2 and can be changed between approximately -200 and -450 by moving the copy density bar 207. If the finished copy Original S rotation is photosensitive drum 1
08 and the voltage fluctuation of the original exposure lamp 104, the copy density lever 20
Even if 7 is set to F, if the density is lower than the desired density, move the copy density correction lever 208a'F in the direction of the bias value and increase the bias value to obtain an image with the desired density. On the other hand, if the density of the original is abnormally low, an image of the desired density can be similarly obtained by moving the copy density correction lever 2087F1 in the opposite direction to the above. .

〔Effect of the invention〕

As explained above, in the present invention, by providing the second density adjustment means, the density adjustment means can be changed in accordance with changes in the sensitivity of the photoreceptor, so that the adjustment range of the first density adjustment means can be changed. Since this can be prevented, appropriate image density can be obtained at normal pressure. In addition, the photoconductor is easy to maintain and the cost per process can be significantly reduced.
f has.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing one embodiment of the image processing device according to the present invention, FIG. 2 is a side view of the operation panel, and FIG. 3 is the same (control circuit diagram). 2 is a characteristic waveform diagram showing the permissible range of the intensity bias value. In the figure, 101 is the main body, 102 is a document platen cover, 103 is an operation unit and document table, 104 is a document exposure lamp, 10
8 is a photosensitive drum, 113 is a paper feed cassette, 119 is an image tip sensor, 201 is a cohesive start key, 202 is a clear/stop key, 203 is a numeric keypad, 204 and 205 are indicators, 206 is an iJI+/manual Copy density adjustment switch key, 207 is copy? I 1. Ruber, 208
is the copy density correction lever, 209 is the same-size copy mode key, 210 is the variable-magnification copy mode selection key, 211 is the copy magnification display key, 212 to 215 are the fixed copy magnification mode indicators, and 216 is the stepless 1ifT copy magnification mode. Display, 217
218 is a stepless magnification lever, 218 is a magnification scale, 219 is a main/weight indicator, and 301 to 303 are NP and PAO. f) AX, ...... is an input or output port, RES
ET is a reset terminal, and lNTl is an interrupt input terminal.

Claims (1)

[Claims] density adjustment means for obtaining an appropriate image corresponding to the original a density, and a second density adjustment means for correcting changes in the image density adjustment range of the first density adjustment means with respect to changes in the sensitivity of the photoreceptor. An image processing device having the following characteristics.