Image-quality stabilizer for an electrophotographic apparatus

An image-quality stabilizer for an electrophotographic apparatus comprising electrophotographic processing means, said electrophotographic processing means including a photoreceptor, transfer means and separating means, said image-quality stabilizer comprising;

• optical detecting means for optically detecting an amount of toner deposited on said photoreceptor;
• process control means for controlling said electrophotographic processing means so that an amount of toner forming a reference toner image on the photoreceptor is equal to a predetermined reference value;
• transfer control means for controlling said transfer means so as to transfer a reference toner image formed after controlling said electrophotographic processing means to a transfer sheet;
• and
• first control means for controlling an output of said transfer means so that a value detected by said optical detecting means after the transfer of the reference toner image is equal to a reference residual value, the reference residual value being obtained by said optical detecting means when the reference toner image for determining the reference value is transferred to the transfer sheet.

An image-quality stabilizer for an electrophotographic apparatus comprising electrophotographic processing means, said electrophotographic processing means including a photoreceptor, transfer means and charger means, said image-quality stabilizer comprising;

• optical detecting means for optically detecting an amount of toner deposited on said photoreceptor;
• process control means for controlling said electrophotographic processing means so that an amount of toner forming a reference toner image on said photoreceptor is equal to a predetermined reference value;
• transfer control means for controlling said transfer means so as to transfer a reference toner image formed after controlling said electrophotographic processing means to a transfer sheet;
• and
• control means for controlling an output of said charger means so that a value detected by said optical detecting means after the transfer of the reference toner image is equal to a reference residual value, the reference residual value being obtained by said optical detecting means when the reference toner image for determining the reference value is transferred to the transfer sheet.

An image-quality stabilizer for an electrophotographic apparatus comprising electrophotographic processing means, said electrophotographic processing means including a photoreceptor, transfer means and pre-transfer charger means used for removing charges on said photoreceptor immediately before a transfer operation, said image-quality stabilizer comprising:

• optical detecting means for optically detecting an amount of toner deposited on said photoreceptor;
• process control means for controlling said electrophotographic processing means so that an amount of toner forming a reference toner image on said photoreceptor is equal to a predetermined reference value;
• transfer control means for controlling said transfer means so as to transfer a reference toner image formed after controlling said electrophotographic processing means to a transfer sheet;
• and
• control means for controlling an output of said pre-transfer charger means so that a value detected by said optical detecting means after the transfer of the reference toner image is equal to a reference residual value, the reference residual value being measured by said optical detecting means when the reference toner image for determining the reference value is transferred to the transfer sheet.

An image-quality stabilizer for an electrophotographic apparatus comprising electrophotographic processing means including a photoreceptor, transfer means and a light source used for removing charges on said photoreceptor immediately before a transfer operation, said image-quality stabilizer comprising:

• optical detecting means for optically detecting an amount of toner deposited on said photoreceptor;
• process control means for controlling said electrophotographic processing means so that an amount of toner forming a reference toner image on said photoreceptor is equal to a predetermined reference value;
• transfer control means for controlling said transfer means so as to transfer a reference toner image formed after controlling said electrophotographic processing means to a transfer sheet;
• and
• control means for controlling a quantity of light of said light source so that a value detected by said optical detecting means after the transfer of the reference toner image is equal to a reference residual value, the reference residual value being obtained by said optical detecting means when the reference toner image for determining the reference value is transferred to the transfer sheet.

An image-quality stabilizer for an electrophotographic apparatus comprising electrophotographic processing means, said electrophotographic processing means including a photoreceptor, transfer means and development means, said image-quality stabilizer comprising:

• optical detecting means for optically detecting an amount of toner deposited on said photoreceptor;
• process control means for controlling said electrophotographic processing means so that an amount of toner forming a reference toner image on said photoreceptor is equal to a predetermined reference value;
• transfer control means for controlling said transfer means so as to transfer a reference toner image formed after controlling said electrophotographic processing means to a transfer sheet;
• and
• control means for controlling an amount of a developer to be supplied by said development means so that a value detected by said optical detecting means after the transfer of the reference toner image is equal to a reference residual value, the reference residual value being obtained by said optical detecting means when the reference toner image for determining the reference value is transferred to the transfer sheet.

An image-quality stabilizer for an electrophotographic apparatus comprising electrophotographic processing means, said electrophotographic processing means including a photoreceptor, transfer means and pre-cleaning charger means for removing charges on said photoreceptor before a cleaning operation, said image-quality stabilizer comprising:

• optical detecting means for optically detecting an amount of toner deposited on said photoreceptor;
• process control means for controlling said electrophotographic processing means so that an amount of toner forming a reference toner image on said photoreceptor is equal to a predetermined reference value;
• transfer control means for controlling said transfer means so as to transfer a reference toner image formed after controlling said electrophotographic processing means to a transfer sheet;
• and
• control means for calculating a transfer efficiency from values detected by said optical detecting means before and after transferring the reference toner image and for controlling an output of said pre-cleaning charger means in accordance with the transfer efficiency.