JPS6343478Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a copying machine that uses a photoreceptor having a photoconductive layer to form an electrostatic latent image.

Generally, in a copying machine that forms an electrostatic latent image, a photoreceptor, which has a photoconductive layer on a conductive substrate or an insulating layer thereon, is uniformly charged in the dark or while exposed to light. A surface potential is formed on the photoreceptor. Unnecessary portions of the formed surface potential are erased by a known method such as image exposure to form an electrostatic latent image. This electrostatic latent image is visualized by a known method using toner, etc.
The image density depends on the surface potential of the photoreceptor on which the electrostatic latent image is formed. Therefore, in a copying machine that forms an electrostatic latent image, it is necessary to apply a predetermined surface potential to the photoreceptor with good reproducibility in order to obtain copies with good reproducibility and appropriate image density.

However, copying is achieved through the synergistic action of the copying machine and the photoreceptor, and the charging characteristics of the photoreceptor vary from production lot to production lot or from individual to individual. In order to obtain the desired density, the main body of the copying machine must be adjusted to obtain the optimum charging conditions for the photoreceptor. Generally, a special measuring device such as an ammeter is required to adjust the charging current value according to the charging characteristics of each photoreceptor.
Furthermore, since high voltages of several kilovolts were handled, adjustments were inaccurate and dangerous.

From the above points of view, the present invention eliminates the complexity, inaccuracy, and inefficiency of adjusting the charging current value on the copying machine main body side, and in order to obtain the appropriate image density with good reproducibility, the present invention has been developed for each photoconductor side. Provided is a copying machine that is provided with a display indicating the optimum charging conditions for the copying machine, is provided with a reading device for the display on the main body side of the copying machine, and provides an optimum surface potential of a photoreceptor with good reproducibility by outputting a signal expressed by the display. In a photoreceptor for an electrophotographic copying machine, which has a photoconductive layer disposed on a cylindrical sleeve and photoreceptor attachment members provided at both ends of the sleeve, for the purpose of On the other hand, this problem could be solved by using a photoreceptor for an electrophotographic copying machine that is provided with an identification symbol corresponding to the optimum charging condition of the photoreceptor on a concentric circle with respect to the rotation axis of the sleeve.

The present invention will be described below based on embodiments with reference to the drawings.

FIG. 1 shows an embodiment thereof. Drum type photoreceptor 6
The sensor 2 reads the identification symbol 1 corresponding to the optimum charging condition recorded in _{the numeral 1} , and the decoder 3 decodes this and outputs it as a signal. The identification symbol 1 corresponding to the optimum charging condition may be, for example, a bar code. And, for example, a barcode may be an optically readable black and white or colored shading sequence, a series of shading areas, a magnetic tape that can be read magnetically, or it can also be formed of conductors and insulators so that it can be read with a current collecting brush. You can.

On the other hand, the surface potential of the drum-type photoreceptor 6 ₁ can be extracted as a signal output by a detector 8 connected to the photoreceptor.

These two signal outputs are connected to a differential amplifier 9 that can control the voltage value and/or current value of the power source 4 so as to obtain the optimum charging conditions for the photoreceptor 6 ₁ . The power supply 4 controlled in this manner causes the corona discharge charger 5 ₁ to discharge, giving the drum-type photoreceptor 6 ₁ an optimum surface potential.

The detector 8 may be replaced with one that detects the amount of discharge from the charger ₅₁ .

According to this copying machine, the surface potential of the photoreceptor 6 ₁ is
Regardless of the copying machine itself, installation location, or bias or variation between copying days, the optimal charging conditions for the photoconductor ₆₁ are maintained completely automatically and at all times, without the need for manual adjustment, to produce an appropriate image with good reproducibility. Density copies can be obtained continuously without failure.

FIG. 2 shows an identification symbol 1 corresponding to the optimum charging conditions for the photoreceptor installed in the copying machine described in the above embodiment.
An example is shown in which the photoconductor is attached to a member attached to the photoreceptor.

A bar code 12 corresponding to the optimum charging conditions for the photoconductive layer 10 (photoreceptor) is attached to the photoreceptor attachment member 11 as an optically intermittent black and white line.

When the identification symbol 1 described in the above embodiment is attached to the photoconductor accessory member, the user can avoid the trouble of code verification and mistakes in verification, and furthermore, the sensor, code decoder, differential amplifier, etc. By incorporating the width container, detector, etc. into the main body of the copying machine, it is possible to provide an integrated copying machine that allows convenient and safe copying.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram of a charge control device of the present invention, and FIG. 2 is a perspective view showing a charge control display provided on a photoreceptor. 1... Code, 2... Sensor, 3... Code decoder, 4... Power source, 5 ₁ ... Corona discharge charger, 6 ₁ ... Drum type photoreceptor, 8... Detector,
9...Differential amplifier, 10...Photoconductor, 11...Photoconductor attachment member, 12...Bar coat.

Claims (1)

[Scope of utility model registration request] In a photoreceptor for an electrophotographic copying machine, in which a photoconductive layer is disposed on a cylindrical sleeve, and photoreceptor attachment members are provided at both ends of the sleeve, one of the photoreceptor attachment members is the sleeve. A photoreceptor for an electrophotographic copying machine, characterized in that an identification symbol corresponding to an optimum charging condition of the photoreceptor is provided on a concentric circle with respect to a rotation axis of the photoreceptor.