JPH01185672A - Copying machine - Google Patents

Abstract

PURPOSE:To obtain an excellent image with high operability by providing a copying machine possessing a function which can adjust the quantity of lamp light and a developing bias independently with a writable storage means storing the combination of an optimum quantity of lamp light and the developing bias and setting the combination according to operator's instructions. CONSTITUTION:An original reading part 1 is provided with a light quantity controller 3 adjusting a voltage impressed on a light source 2 composed of a halogen lamp. An original 5 travelling on a platen glass 4 is lit, the light reflected by the original 5 is led to the exposing part 9 of a photosensitive drum 8 through a mirror 6 and a lens system 7, and an electrostatic latent image is formed on a photosensitive body. Then, a controlled voltage from a debias control circuit 11 is impressed on the developing roll 12 of a developing part 10, and a transfer part 13 forms an image on a photosensitive sheet. In this constitution, an optimum combination of the circuit 3 and the circuit 11 for a special original is set previously, and is stored in the storage means 16. An operator calls back the optimum combination from the means 16 through an input means 14 to form an excellent image on a photosensitive sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a copying machine, and more particularly to a method for adjusting copy trade.

(Prior art and its problems) The quality of copies recorded by an electrophotographic copying machine (hereinafter referred to as a copying machine) is
It is mainly determined by the amount of lamp light in the exposure section and the development bias in the development section.

Therefore, in recent copying machines, in order to obtain copies of optimal image quality, the development bias and lamp light intensity are set to optimal values for normal originals, and for originals with dark backgrounds such as colored originals and diazo copy originals. Increasingly, there are systems in which the development bias and lamp light intensity can be freely adjusted by the operator.

For example, as shown in FIG. 2, the document reading section 1 is equipped with a light amount control circuit 3 that controls the amount of light by adjusting the voltage applied to the light source 2 made of a halogen lamp, and the document reading section 1 is provided with a light amount control circuit 3 that controls the amount of light. The reflected light from the original 5 is guided to the exposure section 9 of the photoreceptor drum 8 via the mirror 6 and lens system 7 to form an electrostatic latent image on the photoreceptor, and this electrostatic latent image is developed. The voltage controlled by the developing bias control circuit of the unit 10 is used to develop the image using the developing roll 12, and an image is formed on the recording paper in the transfer unit 13. The development bias control circuit 11 and the light amount control circuit 3 are set in advance to optimal values for normal documents, and for special documents, the operator 0 controls the control IH@15 via the input means 14 to set the development bias. and the amount of light can be adjusted individually.

Although such copying machines can produce good copies even of special originals, the operator must manually adjust the developer bias and lamp light intensity each time.
There was a problem that the operation became complicated.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a copying machine that has good operability and is capable of making copies of special originals.

(Means for Solving the Problems) Accordingly, the present invention provides a replaceable storage means that stores the optimal combination of lamp light intensity and development bias for a special original, and allows the combination to be set according to an operator's instructions. I am trying to be prepared.

[Function] With the above configuration, if the optimal combination of lamp light and development bias is determined in advance for frequently used special documents and this combination U is memorized, the lamp light can be adjusted individually each time. It is possible to easily switch between the medium and development biases without adjusting them, and it is possible to obtain copies with optimum image quality.

(Embodiment) Hereinafter, an embodiment of the copying machine of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing the structure of this copying machine.

This copying machine is characterized in that the optimum combination of the light amount control circuit 3 and the development bias control circuit 11 for special originals is determined in advance and stored in the storage means 16. This is similar to the conventional copying machine shown in FIG.

For example, the optimal combination for frequently used color originals and diazo copy originals is set.

If it is a normal original, set it to the normal value,
When copying a special original such as a colored original or a diazo copy original, the operator calls up the appropriate optimum combination from the storage means 16 via the input means 14.

In this manner, the operator can easily operate even for special originals, set appropriate values for the light amount and development bias, and obtain copies of good image quality in a short time.

Note that in the case of a copying machine with an automatic tbai adjustment function, this optimal combination can be determined by pre-scanning the original in advance and stored in the storage means.
- It is not necessary to perform preliminary scanning for each sheet, and the time required for copying can be shortened.

(Advantages of the invention) As explained above, according to the copying machine of the invention,
Since the optimal combination of lamp light intensity and development bias for special originals is stored and this value can be rewritten, it is possible to obtain copies with excellent operability and high image quality.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of a copying machine according to the present invention, and FIG. 2 is a diagram showing a conventional copying machine. DESCRIPTION OF SYMBOLS 1... Original reading unit, 2... Light source, 3... Light amount control circuit, 4... Platen glass, 5... Original, 6...
...Mirror, 7.Lens system, 8.Photoconductor, 9.
. . . Exposure section, 10 . . Developing section, 11 .・・・
・Memory means.

Claims (1)

[Scope of Claim] A copying machine with an adjustment function that can individually adjust lamp light intensity and developing bias, comprising a rewritable storage means for storing at least one optimum combination of lamp light intensity and developing bias, A copying machine characterized in that the combination can be set according to instructions.