JPS5910954A - Image forming device - Google Patents

Abstract

PURPOSE:To allow an operator to set a desired appropriate picture density of an image forming device such as an electronic copying machine easily, by selecting one of plural preset picture densities and forming an image according to the selected picture density. CONSTITUTION:When a copy button SW6 is depressed after the amount of exposure of a lamp L is set to a desired value by operating key buttons SW1- SW5 selectiely, the switch SW6 turns on to turn on the lamp L. The density is set to half tones with the SW3, increased with the SW1, and decreased with the SW5, thus setting the density stepwise. Contacts K1-1-K5-1 are contacts for setting the amount of exposure stepwise with the SW1-SW5, and one of them is made at any time. Variable resistances VR1-VR5 are connected to the contacts K1-1-K5-1 to adjust the amount of exposure individually.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus such as an electronic copying machine. In this type of image forming apparatus, such as a copying machine, in order to obtain copies with appropriate image density, conditions such as charging, exposure, and developing means, etc., must be adjusted individually. Need to adjust. Therefore, the charger′・
The strip 14 of the developing device, etc. should be fixed or adjusted only by a specialist such as a service person, and the original image should be fixed.
The exposure mode is changed according to the condition (for example, diazo or color characters), that is, the brightness of the optical image on the photoreceptor surface is adjusted to obtain a high-quality copy that is easy to see.

In such an apparatus, the present invention adjusts the image density fMI in a stepwise manner using a key fob in order to improve the operability of image density adjustment. It was designed to eliminate quite difficult points.

That is, a selection means for selecting one of a plurality of preset image densities in a stepwise manner, -[. The present invention provides an image forming apparatus having a process means for forming an image according to the image density set by the selection means, and an adjustment means for adjusting the process conditions of the process means.

Therefore, with this configuration, the operator can easily set the desired or appropriate image density, and the image density can be made even more appropriate by finely adjusting the process conditions at that image density. It is something that can be done.

The present invention will be further explained below using the drawings.

Figure 1 is a schematic Wr side view of an example of a composite rock to which the present invention is applied;
The figure is a plan view of the operating section, and its operation will be briefly explained below. ◇ The original 1 is placed on the optical system platen 2. After selecting the key buttons SW1 to SW5 in FIG. 2 to set the exposure value of the lamp to the required value, press the copy button (not shown) to turn on the switch SW6 and turn on the lamp L. The reflected light from the original 10 described above passes through a filter 6 that cuts off infrared rays (cuts off visible light), passes through a lens 4 and a mirror 5, and is exposed to a photoreceptor 6. Since the surface of the photoreceptor 60 has already been uniformly charged by the corona charger 7, an electrostatic latent image is created by the exposure. This image is visualized in a developing device 8, transferred to paper 9, and after being fixed in a layered state in a standardizing device 11, it is discharged outside the machine and the required copies are made.

The key button in the stripe 2 diagram is a button that returns automatically after being turned on once, and when SW3 is turned on, the density is set to the middle tone ([4!), and the density is set in steps such as dark with SW1 < light with SW5. This is what you set. The setting is light emitting diode 7
Displayed from 1 to 75. When the main switch 80 is turned on and the W power source is turned on to the copying Isoyabe, or after a predetermined period of time (several minutes) after copying the set number of sheets from the same original using the dial 81, the light emitting diode 76 is automatically turned on.
Turn on and set the density of the intermediate tone.

Figure 6.4 shows an example of a single-light control path, which will be briefly explained below.

In Fig. 6, K1 to K5 are exposure adjustment contacts K1-1 to K5-.
1 (FIG. 4), which is actuated by the driver amplifiers 41 to 45 together with the light emitting diodes 71 to 75. 27.31.52 and 65 are solip-flops that are set by the input of the input signal η to the S terminal when the key buttons SW1 to SW5 are turned on, and are reset by the signal to the Rg terminal, 26.28.2930 and M are the flip-flops 114, 28 is a timer l [[, 21.22] which starts the timer at the falling edge of the input signal N and outputs a timed output.
is the OR gate that sends the 1m number by SW1 to SW5 to the timer, 24 is the AND gate, and 34 is the NOAR gate},
25. 51 to 55 are inverters, 61 is a line for inputting a copy end signal END, 62 is a line for inputting a pee-containing signal CMC, FIG. 4 L is a halogen lamp, Q1
is the triac, Q2 is the trigger diode to start this triac, and 80 and vR1 to VR5 are the triac.
The fixed resistor, capacitor, and variable resistor for determining the current conduction angle of the capacitor Q1, and the SW6 are the copy buttons (in Fig. 2).
operation is maintained until the end of copying), and variable resistance V}
{1 to VFl5 are internal to the copying machine, but they can also be provided so that they can be adjusted by the operating section shown in FIG.

To explain the operation, the case where SW1 is pressed in FIG. 3 will now be described. When SW1 is pressed, 1 is output from the inverter 51. The outputs of the inverters 52 to 55 of the other switch sections are all 0.A 1 signal from the inverter 51 sets the flip-flop 27 via the twin 60, and its output Q becomes 1. This allows relay K
1 is driven, K1-1 in FIG. 4 is closed, and the light emitting diode 71 is turned on. Furthermore, the 1 signal on the twin 60 is input to the OR game 28, 29.50, which sets the output to 1, and resets the flip-flop 31, 52.65"t. This causes the relays K2, K4, K5 to turn OF.
Let it be F. Also, the 111 force of flip frog 27 is 1
Therefore, the output of the γ game}64 becomes 0 and K
3 does not turn on. Further, these postal contracts are retained even if SW1 is opened. When SWI is pressed in this manner, only K1 is turned on, contact K1-1 is closed, and the amount of light is set so as to make the image once more accurate.

Contacts K1-1, K2-1, KA-1, K4-1 of younger brother 4 diagram
, K5-1 are contacts for setting the amount of light in a step-type manner, and one of the contacts is always closed.

uJ7 resist%''LVfl1, VB2, VR5, VR4,
VR511871 MIltAleIdt has been
The exposure is controlled separately when each contact is closed.

Contact K1-1 now? is closed, and when the copy button Sw6 is turned on, the required voltage divided by the variable resistor VR1 charges the capacitor C through the fixed resistor R. When the consolation load reaches a predetermined value, the diode Q2
, the gate K of the triax Ql is discharged, and its Q
1 is turned on. The timing at which Q1 turns on (energization phase angle) is determined by the time constants of time constant circuits VR1 and κC for each AC half-wave waveform of AC100■. ,V
F{1, R, G, Q2, supplied to the lamp L. The emissivity of the lamp L is increased to enhance the luminescence of the lamp L.

When SW2 to SW5 are selected, the output of the gate 26 resets the flip-flop 27 and disables the relay K1. Then, relays K2 to K5 operate, and in the same way, triac Q1 is connected to variable resistance V}t2 to VFl5K.
The signal is allowed to pass at a predetermined phase angle determined by the time constant. Resistor VR5 is larger than VR1, so the triac Q
The phase angle of 1 and 1 is small, so the amount of light emitted by the 2nd layer L is reduced.

Next, an explanation will be given of the operation after the copying operation using the key button SW1 is completed.

1 on line 60 by key SW1 is OR gate 21
．． Set the output of 22 to 1. When the timer 26 is opened after the key SW1 is turned on, the output of the or game 122 falls to 0, and therefore outputs an R pulse of 1 after a certain period of time T from this point. Therefore, at this time; if the bee button is not turned on and left alone, the coby signal gcMC is not output to the signal line 62, so one input of the AND gate 24 is 1, so its output is tie-1[i1't? ! It becomes 1 due to the output girth of r23.

This pulse is input to the OR gates 26.28, 29.30, whose output is set to 1, and the flip-flops 27, 31,
32 and 35 are reset and the output Q is set to O. For this reason, relays K1, K2. K4 and K5 are off, and the output of Noah gate 64 becomes 1, turning on relay K6. On the other hand, after key Sw1 is pressed, copy bomber SW6 is turned on within 1 time T when the timer is set. When copying is started, a copy signal GMC of 1 is input to line 62, and AND gate 24 is opened. Therefore, even if the time limit °f has elapsed, the relay K1 remains on.

Once the predetermined number of lobbies have been completed, a copy of the lobby will be sent (ENI).
is input to the signal line 61, and the signal line 61 receives a signal from {im 1 to 0, which causes the timer (b) path 23 to operate via the OR gate 22. Also, since i 62 is close to 0, the above explanation occurs after the tie V time. In exactly the same way as the flip-flop 27,
51, 52, and 33, turn off the relay K1, turn on the relay K6, and light the light emitting diode 73. Therefore, the dots K6-1 in Figure 4 are closed and the standard exposure state is set.

In this way, if no copy is made again after a certain period of time after copying is completed, turn on the key SW1 and close the contact K6-1 that sets the exposure device to the standard state at a certain time tuIi, Return to standard exposure.

When keys SW2 to SW5 are pressed, they operate in exactly the same way, and return to standard lighting after a certain period of time, making operation easier.
This reduces the number of ξscopies. Also, by selecting each key button, each of the resistors VF11, VB2, VR4, and VR5 can be adjusted to obtain a predetermined exposure amount.
By performing this adjustment as shown in FIG. 4, they can be adjusted independently without giving any shadow 4S1 to each other.

Furthermore, depending on these 01 variable resistors, it is possible to correct the characteristic variations of the lamp L and the characteristic variations of the elements +C, Q2, and Q1.

In addition, when the main switch 80 (FIG. 2) is turned on, virus is generated through a path (not shown) and is injected into the output side of the gate 24, so that after the main switch is turned on, it is always used for semi-exposure. It can be set.

Furthermore, when the effective voltage applied to the two-halogen rung L with a rated furnace pressure of 100 cm is changed, the color humidity of the rung L changes as shown in FIG. When the color temperature (Kl to K4f) changes, the spectral distribution characteristics of L also change as shown in FIG.

Also, if the original is multicolored, the amount of light reflected from the original will increase or decrease in uniform proportion to each color of each wavelength depending on whether the exposure amount is large or small. A convex curve is generated at each wavelength, rather than a straight line.

This results in the inconsistency of the copy obtained depending on the amount of exposure. For example, in a monochrome copying machine, red●●
A copy of the original in black letters 't'14, L/
Maybe the original color is pale overall, so I'd like a copy that makes the entire screen darker. In such a case, it is necessary to lower the effective voltage applied to the lamp L to reduce the amount of exposure. As a result, as the color temperature of the lamp changes as mentioned above, its spectral distribution characteristics also change, and the energy of the visible light becomes relatively low. Since the energy of wavelengths close to infrared light tends to be relatively large, the amount of reflected light in the original black text area decreased in proportion to the operation K, but the amount of reflected light in the red text area decreased due to the above reason. It does not become smaller in proportion to the movement. In the end, the final image will be a copy in which the red text is faint. That is, a copy of red color (longer wavelength) that is closer to or equal to i[! The lily will become thinner.

In this way, when the brightness of the light source is changed depending on the phase control side 1, the spectral distribution characteristics of the light source change, which affects the copied image. To improve this, as shown in FIG. 1, a filter 6 that cuts out infrared rays (cuts long wavelengths) is inserted into the optical system path. FIG. 7 shows an optical fiber 10 inserted into the optical path of a copying machine that exposes light to light, and the other numbers in the figure are the same as in the younger brother 1.

[Brief explanation of drawings]

1 is an abbreviated diagram of the present invention to which the present invention can be applied, Fig. 2 is a plan view of the operating section of Fig. 1, and Figs. 6 and 4 are circuit diagrams of the exposure control device according to the present invention. , Fig. 5 is a graph showing the relationship between light source voltage and light source color temperature, Fig. 6 is a graph showing spectral distribution characteristics depending on color temperature, and Fig. 7 is another copying machine that can be used with pigeons according to the present invention. As shown in the schematic cross-sectional view of SW1-S in FIG.
W5 is the light control Nj key, 71 to 75 are light emitting diodes,
In the younger brother 4 diagram, L is the light source and Q1 is the triax. -347-

Claims (1)

[Claims] selection means for stepwise selecting one of a plurality of preset image densities; 2. process means for forming an image according to the image density set by the selection means; 1. process conditions for the process means; An image forming apparatus characterized by comprising: an adjusting means for adjusting.