JPS63109432A - Copying device - Google Patents

Abstract

PURPOSE:To easily obtain a copy with required density by automatically adjusting exposure and displaying the quantity of exposure required at the time of copying. CONSTITUTION:At the time of copying operation, the output voltage of a power supply 1 is adjusted to V1 by a control voltage E1, an exposure lamp 2 is lighted by the voltage V1 to expose an original and the original is exposed by the automatically controlled light, and copied. At that time, a driving circuit 7 detects the controlled voltage E1 and lights up any one of LEDs 8a-8h in a display means 8. Thereby, a user checks the density and moves an indicator 5d to the left from the LED 8e in case of low density, or moves the indicator 5d to the right from the LED 3i in case of high density, sets up the output voltage Em of a slider 5c to Em1 and then turns a switch 6 to close between contacts C and B and execute copying operation again. Since the output of the power supply 1 is controlled by the manually adjusted control voltage Em1 and the exposure lamp 2 is lighted to expose the original, copies with required density can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a copying machine that detects the exposure amount of a document and automatically adjusts the exposure amount.

(b) Conventional technology In this type of conventional copying machine with automatic exposure adjustment function,
When the original is a colored original, for example, it is not necessarily copied with the desired exposure amount. Therefore, in such cases, it is necessary to correct the exposure amount, so manually adjust the exposure amount! Equipped with a manual adjustment function.

(c) Problems to be Solved by the Invention However, when an excess or deficiency occurs in the exposure amount in the drawing 11 using the automatic exposure adjustment function, and when copying is performed again by switching to the manual adjustment function, the degree of adjustment is unknown, and trial and error occurs. Since it is necessary to search for an appropriate exposure amount in order to make a copy, there is a problem that not only is it time-consuming to copy, but also transfer paper is often wasted.

This invention has been made with these circumstances in mind; therefore, the exposure level during automatic exposure adjustment is displayed in correspondence with the level of manual adjustment, and during manual adjustment, fine adjustments are made using the display as a guide. -4 To provide a copying apparatus that can easily set an appropriate exposure amount by simply adjusting the exposure amount.

(d) Means for Solving the Problems This invention provides a power supply that outputs a voltage that can be adjusted by a control voltage, an exposure lamp that is lit by the output voltage of the power supply, and an original that is exposed by the exposure lamp. The device is equipped with a sensor that detects the amount of light from the source, and an automatic adjustment means that compares the output of the sensor with a set value and outputs a control pressure to the power source so that they match, and automatically adjusts the amount of exposure. (In this case, a) a manual adjustment means capable of outputting an arbitrary voltage in the range of change of the control 1u pressure by manual adjustment and adjusting the exposure III; b) the automatic adjustment means. and a switching means for selecting one of the control voltages of the manual adjustment means and inputting the selected control voltage to the power supply; c) detecting the control voltage during automatic adjustment of the M light amount, and determining the magnitude of the control voltage according to 1111 manual ρ. , a display means for displaying a display corresponding to the adjustment amount of the +4 adjustment means.

(e) Effect: First, when copying is performed by selecting the automatic adjustment means to control the power supply by the switching means, the magnitude of the control signal at that time also corresponds to the adjustment by the manual adjustment means, and the display means will be displayed. Therefore, if there is an excess or deficiency in the exposure amount of the copy result, fine-tune the manual adjustment means by referring to the display on the display means.
By switching the switching means so that the power supply is controlled by the manual adjustment means and copying, it is possible to obtain copies with proper exposure.

(f) Examples Hereinafter, the present invention will be described in detail based on examples shown in the drawings. Note that this invention is not limited to this.

FIG. 1 is a block diagram that does not show the main circuit of this invention.
1 is a power source that outputs a voltage 4 which is proportional to the control Tit pressure E; 2 is an exposure lamp that is turned on by the power source 1 and whose amount of light is proportional to the voltage V; and 3 is a lamp that outputs light h1 from the document exposed by the exposure lamp 2. 4 is a detecting sensor; 4 is an automatic adjusting means for comparing the output of sensor 3 with a set value and, if they do not match, outputting a control voltage r> to a power supply l; 5 is a control voltage comprising a control power supply 5a and a variable resistor 7j5b; 1': a movement adjusting means that manually adjusts rn with a slider 5c and outputs 4゛;
6 selects the control voltage from either the automatic adjustment means 4 or the manual adjustment means 5? Switch for input to li source I, 7
detects the control voltage E output from the automatic adjustment means 4 to the power supply 1 during automatic adjustment, and displays the magnitude of the control voltage E on the indicator light 8 in correspondence with the adjustment amount of the manual adjustment means 5 during manual adjustment. This is a drive circuit that works.

FIG. 2 is an explanatory diagram showing the arrangement relationship between the indicator lamp 8 and the variable resistor 5b, and 8a to 8h arranged in a linear manner constitute the indicator lamp 8. I, E D, and 5d are variable resistors. This is the knob that operates the slider 5b.

The variable range of the output voltage E of the automatic adjustment means 4 is divided into eight equal parts, and L El) 8 a to 8 corresponds to each voltage range.
h is turned on by the drive circuit 7. That is, when the output voltage E of the automatic adjustment means 4 changes from the minimum value to the maximum value, IJ ED 8 a to LED 8 h are sequentially lit.

Also, the variable resistor 5b has a knob 5d h<l? Knob 5 (when moving Knob 1, it faces Knob 5d) and automatically adjusts the display alignment of Knob 8a to 8h.

Control voltage E corresponding to the magnitude of control voltage IC of means 4
The configuration is such that m is output from the sliding part 5c of the manual adjustment means 5.

In such a configuration, first, contacts A-C of the switch 6
Copying is performed using the automatic exposure adjustment function. First, during the preliminary exposure operation (prescan), when the exposure lamp 2 is turned on by the output of the power supply 1 and exposure is started, the light I4 from the document to be exposed is detected by the sensor 3, and the sensor 3 outputs is compared with the set value by the automatic adjustment means 4 and controlled so that they match, and the control 71! I′EF, h<E, is determined. Next, during the copying operation, the output voltage of the power supply 1 is set to V due to the control voltage El.

The exposure lamp 2 is turned on by the voltage vl to perform exposure. Then, the original is exposed to the automatically controlled amount of light and copied. At this time, the drive circuit 7 detects the control voltage E, and the LED 8a of the display means 8
Any of 8h, for example! Turn on 7I and 8c.

Therefore, the user checks the density of the copied image obtained at this time, and if the density is low, turn the knob 5d to LF,
I) If the image density is high, set the knob 5 (1 to LEI) to the right of 8e to adjust the output voltage Em of the slider 5C. Em
After setting the value to +, switch 6 is switched to close contacts C and 8, and the copying operation is performed again. The output of the power supply I is controlled by a manually adjusted control voltage Em + instead of the control voltage E, whereby the exposure lamp 2 is turned on and exposure is carried out, so that a copy of the desired density is obtained.

In this way, when copying using the automatic exposure adjustment function, the degree of exposure of the original is displayed by 4°, and if there is an excess or deficiency in the exposure amount, the display is changed to 1] and the exposure f11 is readjusted. This facilitates adjustment operations to obtain appropriate copy density.

(G) Effects of the Invention According to this invention, since the exposure amount is displayed when copying is performed after automatically adjusting the exposure, the exposure amount can be manually adjusted using the display as a guide. , it becomes possible to easily obtain copies with desired density.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the main control circuit of the present invention, and FIG. 2 is an explanatory diagram showing the arrangement relationship between the indicator light and variable resistor of FIG. 1. l...Power supply, 2...Exposure lamp,
3...sensor, 4...automatic adjustment means,
5...Manual adjustment means, 6...Switch, 7
...Drive circuit, 8...Indicator light, 8
a ~ 8 h ”LP, D. Figure 1 Figure 2

Claims (1)

[Claims] 1. A power supply that outputs a voltage that can be adjusted by a control voltage, an exposure lamp that is lit by the output voltage of the power supply, and a sensor that detects the amount of light from a document exposed by the exposure lamp. , and automatic adjustment means for comparing the output of the sensor and a set value and outputting a control voltage to the power supply so that they match, and that automatically adjusts the exposure amount, the copying apparatus comprising: a) a change in the control voltage; a manual adjustment means capable of outputting an arbitrary voltage within a range by manual adjustment to adjust the exposure amount; b) selecting a control voltage from either the automatic adjustment means or the manual adjustment means and inputting it to the power supply; A switching device; c) a display device that detects the control voltage during automatic exposure adjustment and displays the magnitude of the control voltage in accordance with the adjustment amount of the manual adjustment device. Copying equipment.