IMAGE FORMING APPARATUS

摘要

When attachment of an unused photoconductor unit is detected, a mode is executed in which, during non-image formation, a first current flowing in a charging roller is detected when a photoconductor is re-charged without irradiation of light by a pre-exposure device after being charged and passing through a transfer position during non-image formation, and a second current flowing in the charging roller is detected when the photoconductor is re-charged with irradiation of light by the pre-exposure device after being charged and passing through the transfer position, and a current supplied to an LED lamp during image formation is controlled in accordance with detection results.

主权项

1. An image forming apparatus comprising:
a rotatable photoconductor; a charging unit configured to charge the photoconductor at a charging position when applied a DC voltage; a charging power supply configured to apply the DC voltage to the charging unit; a current detection unit configured to detect a charging current flowing in the charging unit; a toner image forming unit configured to form a toner image on a surface of the photoconductor charged by the charging unit; a transfer unit configured to transfer the toner image formed on the photoconductor by the toner image forming unit by applying transfer voltage to member to be transferred in transfer position; a transfer power supply configured to apply the transfer voltage to the transfer unit; an irradiation unit provided with a light source outputting light corresponding to input, and a guide member guiding the light output from the light source to arrive at the surface of the photoconductor, and configured to irradiate the surface of the photoconductor with the light output from the light source at an irradiation position downstream of the transfer position and upstream of the charging position in a rotational direction of the photoconductor; and a control unit configured to control the input in the light source during image formation in which the toner image is formed by the toner image forming unit, wherein when an unused unit is attached, the control unit executes the following mode in which the control unit detects a first current that flows in the charging unit by the current detection unit when the surface of the photoconductor charged at the charging position passes through the transfer position with the transfer voltage being applied to the transfer unit, the surface of the photoconductor passes through the irradiation position without irradiation of light by the irradiation unit, and the surface of the photoconductor which passed through the irradiation position is re-charged at the charging position, and the control unit detects a second current that flows in the charging unit by the current detection unit when the surface of the photoconductor charged at the charging position passes through the transfer position with the transfer voltage being applied to the transfer unit, the surface of the photoconductor passes through the irradiation position with irradiation of light by the irradiation unit, and the surface of the photoconductor which passed through the irradiation position is re-charged at the charging position, and the control unit controls the input with respect to the light source during the image formation based on the first current and the second current detected in the mode.