IMAGE FORMING APPARATUS

摘要

An image forming apparatus includes an optical scanning device, a duct, and a cooling fan. The optical scanning device has a rotating polygon mirror, a motor which has a rotating shaft fixed to the rotating polygon mirror, and a housing that accommodates the rotating polygon mirror and the motor. The duct is disposed adjacent to the optical scanning device, and a part of the rotating shaft is exposed into the duct. The cooling fan generates airflow inside the duct. A sectional area of the duct becomes gradually small toward the part of the rotating shaft exposed into the duct from an upstream side of the part of the rotating shaft exposed into the duct with respect to a flow direction of the airflow in the duct, and a sectional area of the duct becomes large at a downstream side of the part of the rotating shaft exposed into the duct.

主权项

1. An image forming apparatus comprising:
an optical scanning device including a rotating polygon mirror that deflects and scans beam light from a light source unit with respect to a surface to be scanned, a motor having a rotating shaft to which the rotating polygon mirror is fixed and rotationally driving the rotating polygon mirror, and a housing that accommodates the rotating polygon mirror and the motor; a duct having a rectangular section and disposed adjacent to the optical scanning device, a part of the rotating shaft being exposed into the duct; and a cooling fan that generates airflow which flows inside the duct, wherein a sectional area of the duct becomes gradually small toward the part of the rotating shaft exposed into the duct from an upstream side of the rotating shaft with respect to a flow direction of the airflow in the duct, and a sectional area of the duct becomes large at a downstream side of the part of the rotating shaft exposed into the duct.