JPS62168166A - Electrostatic device for recording - Google Patents

Abstract

PURPOSE:To inhibit an image from being transferred to a transfer material in a measurement cycle and to prevent the time required for image formation from becoming long by providing a measurement cycle before and after a process cycle. CONSTITUTION:The current of a power source 24 is applied to a lamp 22 with a switch SW8 on and a photosensitive body is irradiated with slit light SL. Further, the output signal of a timer circuit 61 falls to drive a timer circuit 62 and an 'H' signal is led out to only a signal line l2, so that a latent image for measurement is read out. Then signals corresponding to a light part charge image and a dark part charge image are obtained at a terminal 39 through the electrostatic discharging of an electrostatic discharger 17. The driving period of the timer circuits 61 and 32 is the measurement cycle. The output signal of the circuit 62 falls to drive a timer circuit 63, so that a copying process is entered.

Description

[Detailed description of the invention] The present invention relates to an electrostatic device for recording.

Electrostatic devices such as electronic copiers and electrostatic printers use photoreceptors such as corona discharge, Se, and CdS, but these are directly affected by humidity, temperature, changes over time, etc. The electrostatic latent image formed varies considerably even if the exposure amount and the voltage applied to the corona discharger are constant.

Therefore, even when such an electrostatic latent image is visualized using toner, the image obtained by visualization is unstable.

In order to eliminate such defects, it is sufficient to measure the latent image or developed image, and control temporary charging, exposure, developing bias, etc. based on the measurement results. As mentioned above, is it possible to perform the control cycle all the time, or if it is attempted to be performed all the time, the area where the measurement image is formed in the area where the electrostatic latent image is formed on the member where the electrostatic latent image is formed Therefore, even the member on which the electrostatic latent image is formed must be changed for the purpose of the control cycle, and the device becomes larger. Furthermore, even when there is no need to perform a control cycle, time is wasted and the time required for image formation becomes longer.

The present invention aims to eliminate the above-mentioned drawbacks.

That is, the present invention provides an electrostatic recording device in which an electrostatic latent image for recording is formed on a member on which an electrostatic latent image is formed by a latent image forming means, and the electrostatic latent image for recording is developed by a developing means. A process cycle in which the m-image is transferred to a transfer material, and a measurement light image is irradiated for a predetermined period of time into the latent image forming area that contributes to the transfer of the electrostatic latent image forming member, and the measurement image is measured. , controlling the latent image forming means according to the measurement result, having a measurement cycle independent from the process cycle, executing the measurement cycle by applying a recording start command, and automatically after a predetermined time of the light image irradiation. a first mode in which the process cycle is executed; and a second mode in which the process cycle is executed without executing the measurement cycle upon application of a recording start command; An object of the present invention is to provide an electrostatic recording device that inhibits transfer to materials.

This allows measurement cycles to be performed as needed, thereby preventing an increase in the time required for image formation.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

First, the formation of a latent image for measurement in an electrostatic copying apparatus and the reading of the latent image for measurement will be described in detail with reference to FIGS. 1 to 6.

FIG. 1A is a side view showing the main parts of the electrostatic copying apparatus.
In such a device, a photosensitive drum (photosensitive body) (hereinafter referred to as a blank space) 11 includes an insulating layer 12, a photoconductive layer 13, and a conductive substrate 1.
It consists of three layers of photoconductive layer 135N! The photosensitive drum 1lFi is charged positively when the M type is charged, and negatively when it is a P type.

Incidentally, FIGS. 2A and 2E show the cross section of the photosensitive drum and its equivalent circuit, and the insulating layer 12t'! The parallel circuit of the resistor R12 and the capacitor 012 can be replaced with a parallel circuit of the photoconductive layer 13, the resistor RL3, the capacitor 013, and the diode D13 (provided that the source is not irradiated).

Therefore, the DC voltage obtained from the DC m source 15 is applied to the switch SW.
If the voltage is applied to the corona charger 16 via I, at the end of the −th charge, #:tF! ! , light body l on light body l
Charge exists as shown in the figure.

In terms of an equivalent circuit, -order charging is equivalent to connecting a direct current source 15 between terminals T and T', as shown in Figure 3B, and is equivalent to charging a capacitance of 012.013. .

Next, a DC voltage of opposite polarity is applied to the power supply 18 during the negative charging.
The light 2o obtained from the light source 19 is applied to the corona static eliminator 17 via the switch SW2.
1. (The state at this time is shown in Figure G8AK) It has a light source 19, a lamp 22, and an optical system 23 that forms the light of the lamp 22 into a slit shape. The lamp 22 is driven by applying a current t24Th through the gate 25.

It is controlled by the output of the generator 26 which generates a rectangular wave of a constant frequency via the 25Fi switch SW6. For example, when the rectangular wave is at a high level, the gate 25 is closed. Control is performed such that the lamp 22 is turned off, and when the level is low, the gate 25 is opened and the lamp 22 is turned on.

Therefore, if the duty of the rectangular wave is 5%, there will be stripes on the photoreceptor 11 over the area as shown in FIG. Simultaneous exposure is performed in a similar manner.

The light intensity of the light 20 is approximately equal to the light having the strongest light intensity among the light 29 that is reflected from the original 30 on the original table 27 when the original table 27 is irradiated with a lamp 28, which will be described later. Preferably equal.

By performing static elimination and light irradiation as described above, the charge on the part where the original is irradiated disappears, and the charge on the part that is not irradiated with light remains, as shown in Figure 4.

If we explain it using an equivalent circuit, the part where only static electricity has been removed is equivalent to short-circuiting between terminals T and T' as shown in Figure 4B, and some of the charge in capacitor 012 is transferred to capacitor 013. This is equivalent to being charged as shown in the figure.

On the other hand, the area where the charge has been removed and the light has been irradiated is tilted as shown in the Fia diagram, and the diode ~)-D13 is also short-circuited, and the charges of the capacitors Q l 2 and 013 are both zero. It is equivalent to .

Next, when the entire surface is exposed using the lamp 32 to which direct current is applied to the direct current source 31 via the switch SWS, the electric charge of the insulating layer 12 in the area not exposed to light is preserved, as shown in FIG. Swelling and areas exposed to light will remain that way.

To explain using an equivalent circuit, the entire surface is exposed by the diode D1.
This is equivalent to short-circuiting 3, so in the area where the light did not hit, the charge of capacitor fio13 is discharged as shown in Figure B, and in the area where the light hit, the state N#'i is as shown in Figure B. It is something that does not change.

Therefore, in FIG. 4B, the surface potential of the photosensitive drum with respect to the conductive substrate 14 is close to zero, but in FIG.
The surface potential increases by the amount of charge stored in the image, improving contrast.

In this way, an electrostatic latent image is formed on the photoreceptor 11, but in the above explanation, instead of DO static elimination,
It is well known that it is okay to use electricity.

It is a corona static eliminator that does not irradiate light with a lamp 35 and has the same structure as those shown by 33 and 17, and includes the above-mentioned #itEM image forming means (corona static eliminator 16, corona remover 17) , light 2o, lamp 52)
By eliminating the /Pm latent image formed on 1, the current caused by the discharge of the latent 2 charges is led to the terminal 39 as a potential between the conductive substrate 14 and the resistor 38 connected between the ground, and the electrostatic latent image is removed. This is to read out the image.

Such static eliminator ssK#i is directly KI via switch 814.
1134, and the lamp 35 is turned off directly. 1
t11! The current from the source 37 is applied via the switch SW5.

If we were to explain such #electricity using an equivalent circuit, it would be as shown in Figure 6. In the area N& where light does not shine, the charge of capacitor C12 is FIl, as shown in the sixth graph B, and the current a1'
Flows through the S resistor 38, thereby creating a voltage II4 at the terminal 39.

- 10,000, in the area where the original hit, as shown in Figure 6 0, there is no charge held in each company 012, so it is discharged? &F!
It doesn't flow.

The switches S W 4 and S W 5 are turned on after a certain period of time tl after the electrostatic latent image is formed on the photoreceptor 11 by the electrostatic latent image forming means, and are turned on at the same time as this turning on or for a short time #'iw Optical time antecedent switch SWI.

Si2. ! l! Turn off W3 and switch L1 and SW6
is turned off to stop the application of the lifting power to the lifter 260, and the gate 25 is closed to stop the lamp 220 from emitting light.

The photoreceptor l rotates in the direction of arrow S at a constant speed for the time tl.
Since the time required to form at least the latent*t-1 period of the striped pattern on the photoconductor 11 is set to the time required to form the striped pattern latent image on the photoreceptor 11 in this way, the static eliminator 33 When the photoreceptor 11 reaches the corresponding position, the electric charge and light irradiation are performed at the same time, so that the electric charge on the photoreceptor 11 is discharged, and this current of discharge 11i flows through the resistor 38.

Therefore, a rectangular voltage signal can be obtained at the terminal 39, for example, as shown in FIG. 9A, which has a rectangular shape and changes between voltage levels v1 and v2.

Note that the charge image formed in the area where the Vltf light 20 light layer 0 is applied (theoretically should be #: to , , v,
Actually, charges remain in the area irradiated with the light 20, so such an area is called a bright charge image) v2 is a distorted charge image (dark charge image) formed in an area not irradiated with the light 20. ).

The above cycle is a constant cycle, and in this way, it is possible to control the controlled member at the same time as executing the measurement cycle.

That is, by controlling the pressure of the source 15 using the voltage v2 and controlling the intensity of light irradiated onto the photoreceptor 11 using the voltage vl, (by opening and opening with the surf motor 47)
The most preferable #electronic latent image can be formed on the photoreceptor 11.

After the control cycle as described above is completed, the normal v
I copying process (process cycle) iC is entered, and switch sw1. sw2. Turn on sws again and
i4. Turn off Si5 and turn L1 back on to W Mandai 2? A switch SW that controls the lamp 28 that controls the lamp 28 that irradiates the
When W is turned ON, a current from the electric current W, 41 is applied to the lamp 28 to turn it on. After that, the area on the photoreceptor ll charged by the charger 16 (this area #'i has already been subjected to the most preferable band 1i) is at least charged by the charger 16.
When it reaches rn, which is opposite to the document platen drive mode★
By driving the Mf switch 5WII and moving the document table 27 on which the document s2 is placed in the direction of arrow M, the light 29 reflected by the document (of course it may be transmitted) is reflected by the mirror 42. Then, the VC is passed through a controlled aperture 46 and a half mirror to pass through the proper VC scene, and is irradiated to the Wk voltage position as the slit source SL shown in FIG. After the fn image is visualized with toner by the developing device 43IIcif-, the toner image is transferred onto a transfer paper (not shown) by the transfer iv44, the residual toner on the photoconductor is removed by a cleaning blade, and the photoconductor 11 is re-hidden. This is to prepare for image formation.
[execution of two cycles] can be realized, for example, by a circuit as shown in FIG. T: 3゜T
This is a timing circuit that measures 4, and during the timing period, the signal line TJ
This is for deriving high level signals from L to L4.
Thus (M'j JsT-1~L4 is the signal @Ol
~07.

011 are formed in a matrix shape, and the locations indicated by circles in the figure are locations where the signal line and 0 are diode-coupled.

Signal [01~O), 01lFi each switch SWI~S
This is a signal line for controlling W7, 5ill, and signal line 0
WI4, from which a high level signal is derived, causes the switch s
wFioy, and a low level signal is derived to turn off.

The terminal 54 is a terminal that applies a copy signal (recording start command) derived by the operation of the copy command button, and a higher level signal than the clock circuit 50 (other clock circuits 51 ~53 low level signals]
Doro.

Therefore, when the copy signal is applied, the switch SW opens at T1.
I, SW2, SW3, and SW6 are turned on, and the other switches tf are turned off. However, if necessary, the switch SW4.5W5FiON may be used.

The opening T1 is the time to form a frI image of a striped pattern for measurement, and the KM? The m formed by the lamp 22 due to the elapse of the time T1 is sufficient.
If the statue is at least as large as the lamp 32, i! The clock circuit 51 is driven by the fall of the output signal of the clock circuit 50, and the time rtRT 2 K
A high level signal (another signal line I11.
I, 3. L4 low level signal) is derived.

Therefore, for 72 hours, switches SW4.3W5 are ON and the other switches are OFF.

This time T2t'j is the time to read out the latent image for measurement,
To the terminal 39: Any time is sufficient as long as it is sufficient to obtain signals for reading out the bright area #@ and dark area WI images formed by the lamp 22.

The cycle caused by the driving of the time measurement (b) paths 150 and 151 is a measurement cycle.

The falling of the output signal of the clock circuit 51 drives the clock circuit 52, and a high level signal (another signal line?', 1.L2.L4 low level signal) is sent to the signal line L3 for a period of time T3. Derive.

Therefore, T3 time dX 17chi S WI NS W5,
Turn SW7 ON, X17CH SW6.5w1xt-op
Let it be F.

This time T3f'i is part of the normal W copying process and is the primary charging time for forming the information m image.
The time required for the area of the photoreceptor 110 facing the static eliminator 171c to face the static eliminator 171c is sufficient.

Due to the fall of the output signal of the clock circuit 52, the clock RIg
Circuit 53yj; driven, signal line L4 over time T4
A high level signal (other signals 11Ll to 1.3#-i low level signal) is derived.

Therefore, for 74 hours, switches SW1 to SW3 and SWγ
, 3W11 turns on and switch SW4゜SW5.5W
15 is turned off.

4#-i This is the remaining part of mt recording time rTJj T s in the normal copying process, so the original platen 2
7 Necessary reflection 5Ie is reflected on photoconductor 1 in area D (Figure 8)
It is sufficient that the time is sufficient for irradiation, development, and transfer.

Therefore, the cycle driven by the 7ie clock circuits 52 and 53 is a process cycle.

In the above embodiments, a photoconductor having a three-layer structure was exemplified, but the present invention can be applied similarly to a photoconductor having a two-layer structure, in which the insulating layer 12 is removed from the first photoconductor 11. It is possible for the government to have real power.

In this case, one static eliminator and 32 lamps are not required to form the electrostatic latent image shown in FIG. B
A circuit as shown in FIG. 1 can be used, and the structure is extremely simple compared to the case where a three-layer photoreceptor is used.

The control circuit of the 62M4 configuration shown in FIG. 10 can also be used. However, No. 74 [02゜zero〇3,05tlj is uneasy.

In the example shown in Figure 1, we have explained a case in which a 11L lamp 33 and a lamp 35 are newly added in addition to a normal copying machine. Alternatively, the lamp 22 can be used as is.

Is Figure 7 a small example? The parts with the same numbers as those in Figure 1 are made of the same members as those in Figure tIX1, and have the same functions.

In this embodiment, a static eliminator for forming a static WL latent image and a readout eliminator 1! By making the device double, a new switch SW is added.
8. It is provided by adding SW9 and 5WIO.

That is, when the switch SWa is turned on, 1m11! regardless of the operation of the gate 25! ! 24? IE style lamp 22
Therefore, when the switch SW8 is turned on, the slit-shaped source SL shown in FIG. 8 is always irradiated onto the photoreceptor.

Switch SW9.5WIO is a switch for stopping the functions of the developing device 43 and the transfer device 44, respectively. When these switches are turned on, the developing device and the transfer device perform their original functions, and when they are set to oyy, their functions are stopped. is something that can be stopped.

Is the 11th PJ III? The switch control circuit that controls each switch SW in the device shown in the figure is further shown in line #, and the signal line! 1 to j4 and signal lines c/l to a19 are diode-coupled at the points indicated by circles, and signal lines #c/l to
When a high level signal is derived at c/9, the corresponding switch SW is turned on.

Signal plum/IK high level signal is derived and switch 13W
l~SW3. SW6 turns ON, and switch SW)~5
Wll is turned off.

This time t1 is the time to form a latent image of the IT4 pattern for measurement, so after passing the position facing the charger 16 and facing the cold photoreceptor 11 or the lamp 32, there is a slight delay. & (it is sufficient that at least 41 sets of bright charge images and dark area charge images are formed).

From the fall vK of the output signal of the clock circuit 61, the clock circuit 6
2 is pivoted, and the priest level signal is derived only from the signal line 12 over time t2.

Therefore, during the time period t2, only the switches SW2 to SW8 are turned on, and the other switches SW are turned on.

Since the time t2 is the time to read out the latent image for measurement, the tip (
It is preferable that the photoreceptor 11fl (supposed to rotate at a constant speed in the direction of the arrow S) passes through the static eliminator 17 for a sufficient amount of time to be read by the static eliminator 17. As a result, a bright signal and a dark signal corresponding to the bright portion load t and the dark portion charge - are obtained on the terminal 39. The driving period of the clock circuits 61 and 62 is a measurement cycle.

The fall of the output signal of the clock circuit 62 drives the clock circuit 63, and a high level signal is output only to the signal line 13 at time t3.

Therefore, during the time t3 period, the switches S'#l~S
W3゜SW7. SW9 and 5WIO are turned on, and the other switches are set to opy.

This time t3 is the time for performing primary charging in a normal copying process, and may be sufficient as long as it is sufficient for the portion facing the band's charger 16 to pass through the static eliminator 17.

The fall of the output signal of the clock circuit 63 drives the clock circuit 64-S, and a high level signal is output only to the signal line 14 for a time period t4.

Therefore, during such time period t4, switches 8W6. SW8 turns OFF, other switches turn ON, and the original platen 27
starts moving.

Since the time t4 is already in the normal copying process, it is sufficient that the time t4Fi is sufficient time to carry out the well-known normal copying process.

Since this is the remaining portion of the time t3 in the normal copying process, the reflected light from the document table 2 is irradiated onto the photoreceptor 11 in the width of the area D (Figure 8), and is sufficient for development and transfer. It's fine if it's time.

With #1 configuration as described above, it is possible to read out the charge in the bright area and the charge in the dark area as a voltage signal.Such voltage is applied to a circuit as shown in Figure 12, and it is possible to read out the charge in the bright area and the charge in the dark area as a voltage signal. can be controlled.

That is, since the terminal 39);j in FIG. 12 is the terminal shown in FIGS. 1 and 9, a signal as shown in FIG. 13 AK is applied thereto as described above.

These signals are applied to the gate circuits To and 71, respectively.
The gate signal application terminal 39-2 of such a gate circuit is connected to the terminal 39-1 of the oscillator 26, respectively, and the terminals shown in FIG.
0 (however, the signal shown in FIG. 0 is inverted from the inverter 721C) is applied to the gate signal IJ[I.

However, if the phases are not aligned as shown in Figure 13, terminal 3
A delay circuit or a phase control circuit is inserted between the terminal 9-1 and the terminal 39-2 to match the phases.

These gate circuits 70 and 71 output the signals applied to the output lines 73 and 73 when a high level gate signal is applied, respectively.
74, so the output line) 5. ? The signals obtained on 4 are shown in Fig. 13, respectively.

Like X.

Therefore, is such a signal a peak hold circuit? If the voltage is applied to and held at 5.76, the output lines 77.7BK and Y2,
71 firefly level signals can be obtained.

The level signal is applied to voltage comparators '79 and 80 and compared with the voltages applied from reference voltage applicators 81 and 82, respectively, and an output corresponding to the difference is derived to output lines 83 and 84. do.

The signal obtained on the output line 83 is used as No. 7g to control the electric fAl 5, and the signal obtained on the output line 84 is used as a control signal to control the servo motor 47 to control the aperture 46. If this is done, the primary charge can be controlled by the dark charge on the photoreceptor, and the exposure can be controlled by the bright charge.

The output signal obtained on the output 4181 is applied to the decoder 83, and the output of the decoder 83 @a 3-1 to 83-7
Among them, any Th1 output S is selected according to the applied signal.

Similarly, the output signal obtained on the output line 82 is applied to a decoder 84, and the outputs at 84-1 to 83- of the decoder 84 are
7, one output line is selected according to the applied signal, such an output! ! 83-1~83-7.84-1~84-7
are the power supply 15. Since the voltage is applied to the servo motor 47, the power supply 15 is connected to the selected output line ss-1.
If the output voltage is configured to change according to ~83-7, and if the servo motor 4 is configured to rotate to a predetermined position according to the selected output line, - Next charging and exposure amount can be controlled automatically.

The clock circuit 52. The clock circuit 63KVi is further provided with other input terminals 55 and 65, and these terminals are used when a recording start command is issued by operating the copy button - when there is no need to execute a measurement cycle. By applying this recording start command as a trigger signal to the terminal 55 or 65, the measurement cycle can be omitted and the process cycle can be directly started.

In a normal electrostatic W imager, once the control cycle is executed, if the image forming means and the microscope means are 1 inch UL, there is no need to execute the control cycle for a while (the usage mode or environment suddenly changes). In such a case, only the process cycle may be executed continuously for a predetermined period as described above.

Figure 14 shows a circuit 1 that executes a measurement cycle every predetermined time (for example, 30 minutes), and 90 is a command signal generator that instructs the copier to start copying. , the signal Fi9 generated by this command signal generator
The signal is applied to the waveform shaping circuit indicated by 1 and shaped into a pulse signal (command pulse). Such command pulse (915 figure) #-
i-timer circuit 92vc) applied as a trigger signal,
The signal is applied to the AND gate 94 at the same time as instructing the timer circuit 92 to start operating.

As shown in FIG. 15B, the timer circuit 92 changes to a high level by the first command pulse PL, and maintains the soft part until a predetermined time Tl has elapsed. The clock time is not affected by the pulse], changes to a low level after 1 time has elapsed, and starts clocking again by applying the command pulse P6.

#i indicated by 93 is triggered by the rising edge of the output of the timer circuit 92, and the command pulse P is also
This is a one-shot multiplier that generates the first s (Fig. 0), the output of which is led out to terminal 95.

On the other hand, since the command pulse P and the output of the one-shot multi 93 are applied to the antgame 94KH, the output terminal 96 receives a pulse signal as shown in FIG.

Therefore, the terminal 'F95 is connected to the terminal No. 5 in FIG. 10 and the terminal #'i is connected to the terminal 60 in FIG.
5, after applying a command pulse and executing a measurement cycle and a process cycle, if the command pulse is applied for a certain period of time T1, the process cycle is started without executing the measurement cycle. Execute only at certain times +
The mark of the first command pulse after 111 t! The measurement cycle and process cycle are executed again by step a.

Figure 16 shows t! This shows an example of Ka, in which a command pulse is applied to measure the number of times, and when this number reaches a predetermined number, a measurement cycle is added to the process cycle by applying the command pulse. It is something to be carried out.

That is, the command pulse (FIG. 17A) obtained by the waveform shaping circuit 91 is applied to the counter 9'FK, and at the same time, the command pulse (FIG. 17A) is applied to the counter 9'
99.98.

Starting from a predetermined number (N) of 98 counters shown in FIG. 17B,
) is applied, a low level signal is derived. In Fig. 16, N = 71, after counting a predetermined number of command pulses, a high level signal is derived, and then again by application of the next command pulse P8. It consists of a ring counter that returns to its initial state.

Therefore, when the command pulse P1 is applied in the initial state a of the counter (output is at a low level), the counter starts operating, and continues counting (until ti reaches the above-mentioned N=7), the output terminal of the AND gate 99
When the count value reaches Nj7, the know output shown in FIG. 17 is obtained from the output terminal 100 of the AND gate 98.

Therefore, terminal 101 is connected to terminal 55 and 65, and terminal 1
If 00 is connected to the terminal 54 and 60, after applying the command pulse and executing the measurement cycle and the process cycle, the command pulse is applied the predetermined number of times (N times).
In this method, even if a command pulse gold is applied, only a process cycle is executed without executing a measurement cycle, and after counting a predetermined number of times, the measurement cycle and process cycle are executed again by applying the first command pulse.

Recommended 18 Fl! J indicates yet another embodiment, in which 1'! at a predetermined time. After 4ff has elapsed and after t, a measurement cycle is executed each time a predetermined number of command pulses are applied.

The command pulse that is useful in the waveform coloring circuit 91 is sent to the timer circuit 10.
However, this timer 11J1 path 102 starts measuring time only after a command pulse is applied in the initial state, and after a predetermined time 1 [T1 has elapsed, the O output becomes a high level.
The high level state of refusing is maintained until a reset signal is applied, and the application of the reset signal returns to the yJ period state IK and the output becomes low level.

Therefore, the command pulse and the output of the timer circuit 102 are output from the used AND gate 103 until the predetermined time T1 elapses. It is something that cannot be calmed down.

104 is a predetermined number! This is a counter that counts fI1.J, but the total fI1. t- starts, and after counting a predetermined number N, its output becomes high level, and this high level state is maintained until a reset signal is applied, and by application of the reset signal, it returns to the initial state, and outputs is at a low level.

Therefore, after the predetermined time T1 has elapsed from the AND gate 106 and the command pulse has been applied a predetermined number of times, an output is obtained for the first time from the AND gate 107.
The output y′1 is obtained at times other than when the output is increased. (Reset) (1 recordable timer circuit 102 as No. B)
, is applied to the counter 104.

When one command pulse is obtained from the AND gate 106 by the reset circuit that declines, the timer circuit 102 DEG counter 04 is set to zero and the initial state is established.

Therefore, in the circuit shown in @1a14, terminal 109 is connected to the terminal 54 or 60, and terminal 110 is connected to the terminal P.
If connected to 55 or d60, after the command pulse is applied and the measurement cycle and process cycle are executed,
The above-mentioned fixed time T1 is counted, and in addition to this, the number of QiJ recordings N
Even if a command pulse is applied, only the process cycle is fully executed until +pr ? is counted. After counting a predetermined time T1 and counting the number of times N, a first command pulse is applied to execute a measurement cycle and a process cycle.

FIG. 19 shows yet another example of actual control, in which a predetermined time period of 1 or more has elapsed since the command pulse P1 was applied, and a predetermined number N or more has elapsed since the command pulse P1 was applied. The command pulse Vi obtained by the 0 waveform shaping circuit 91, which executes a measurement cycle every time a command pulse is applied. 0 is applied to the counter 113 consisting of 0. Therefore, the AND gate 112 obtains the command pulse that is the output for the first time after the predetermined time T1 has elapsed, and the AND gate 114 outputs the command pulse for the first time after counting the predetermined number of command pulses. get.

The outputs of such AND gates 112 and 114 are marked 1111.
The Antogame) 115Th and others will obtain the output only when the output is derived from both AND gates 12 and 114, and the Antogame) 116Th and the Antogame)
This is to obtain an output when no output is obtained from 11L5Th.

The output of the AND gate 115 is sent to the timer circuit 111 and the counter 113 as a reset signal via a delay circuit 117 having the same configuration as the delay circuit 108.
It is applied to

Therefore, terminal 11-119 is connected to terminal 54 or #'i6o!
At the same time, by connecting terminal 11 to terminal 55 and 65, after applying a command pulse and executing a measurement cycle and a process cycle, 1 and M
Before both of the counts N are achieved, even if a command pulse is applied, the predetermined cycle is not actually executed, but the process cycle is executed, and the predetermined time T1 has elapsed, and -J After counting the number of times N, the measurement cycle and process cycle are executed again by applying the Nk off command pulse.In addition, g14, 16,
In Figures 18 and 19, members with the same number are made of the same member and have the same function.

In paragraphs 14.16 and 18.19, it was explained that the timer circuit and the counter measure the predetermined cooling time Tl and the number N, respectively, but the time T1 or the number N may be changed depending on, for example, temperature changes. Of course, you can do it like this.

Father, did you explain that the measurement cycle is executed before the process cycle?Such a measurement cycle can also be executed after the process cycle, and if the photoreceptor is subjected to such a measurement cycle before the process cycle. There is no need to set aside a special time for the measurement cycle if it is carried out during the previous rotation of the measurement cycle or during the subsequent rotation of the measurement cycle.

As described above, since the present invention provides a measurement cycle before or after a process cycle, the area on the electrostatic latent image forming member is the same as or a part of the area used in the process cycle. The area can be used for the measurement cycle, and the parts used in the process cycle can be used in the measurement cycle.

Since the apparatus is designed to start this measurement cycle in a predetermined vertical position, no manual operation is required to start the measurement cycle.

[Brief explanation of drawings]

1st VAA, Bt'i Block diagrams showing the main parts of the electrostatic device control device according to the present invention, @Fig. 2A, Fig. 3. Fig. 4A, Fig. 5A, Fig. 6Aq: Cutaway view of the photoreceptor to explain the formation of a latent image on the photoreceptor, Fig. 2B, @ 3
Figure B, 4th IAB, 0, δ Figure B. C, g ts diagram B, a#i equivalent circuit diagram of a photoreceptor to explain the formation of a latent image on the photoreceptor, FIG. Figures 8A and B show the !s! section of the device. Figure 8 is a top view and front view of the light body that forms a latent image for measurement according to the present invention. Figure 9 is a voltage waveform diagram of the resolved signal read out. , Figure 10, @
The X1 threshold is the first threshold, the command signal circuit diagram for commanding the operation of the device shown in FIG. 7, the block diagram of the latent image signal processing circuit that produced t' in FIG. FIG. 13 is a waveform diagram for explaining the operation of the processing circuit shown in FIG. 12; No. 141N is a block lIa diagram of a selection circuit that determines whether to select a process cycle or measure a measurement cycle; No. 158! J is a waveform diagram for explaining the operation of the selection circuit in Figure 1, and Figure 16 is a block diagram of another example of a selection circuit that determines the force 1 for selecting a process cycle or measuring a measurement cycle. Figure 17 #'i coffin Waveform diagram for explaining the operation of the selection circuit in Figure 16, @Figure 18, Figure 19
The figure is a block diagram of another embodiment of a selection circuit that determines whether to select a process cycle or to measure a λ measurement cycle. Here, 11 is a photoreceptor, 151″tlaiL'X%16
is a charger, 17.33 is a static eliminator, 19 is a light source, 22 is a lamp, 25 is a gate, 26 is a light source, 27 is Hara Mikidai, 2
8, 32.35 is a lamp, 38 is a resistor, 43 is a current +2 device, 44 is a transfer device, 46 is a scatterer, 47 is a servo motor, 7
o, 71 gate circuit, 75.76 is peak hold circuit, 79.8Q is comparator, 9゜t'' command signal generator,
91Fi waveform shaping circuit, 92°102.1llt'J tie v -11n [5,931'i one-shot multi, 97.104. l13 is the counter, 94.98,99
,106,107,112,114゜115.1161
It is j and gate. Special Jf A3 applicant Canon Co., Ltd. σ-') Agent Gi Marushima -, 4[+
-1-- Stone 2 figure A 7!3
C also 8 mouths

Claims (1)

[Scope of Claims] In an electrostatic recording device, an electrostatic latent image for recording is formed on a member on which an electrostatic latent image is formed by a latent image forming means, and the electrostatic latent image for recording is visualized by a developing means. A process cycle in which the developed image is transferred to a transfer material, and a measurement light image is irradiated for a predetermined period of time into the latent image forming area that contributes to the transfer of the electrostatic latent image forming member, and the measurement image is measured. death,
controlling the latent image forming means according to the measurement result, having a measurement cycle independent of the process cycle, and executing the measurement cycle by applying a recording start command;
A first mode in which the process cycle is automatically executed after a predetermined time of the light image irradiation, and a second mode in which the process cycle is executed without executing the measurement cycle upon application of a recording start command. An electrostatic recording device further characterized in that transfer to the transfer material is prohibited during execution of the measurement cycle.