Patent attributes
In a laser beam printer, an elastic conductive member is disposed between a rotating axis of a transfer roller and a land portion of a power supply circuit board and the transfer roller is electrically connected to the power supply circuit board through the elastic conductive member. A front end portion of the elastic conductive member is pressed onto the land portion by its elastic force to come into contact with a solder pad formed on the surface of the land portion for electrical connection. A resist film is partially formed on the surface of the land portion and the solder pad is formed on the region on the land portion that is not covered with the resist film. Thus, a large contact area between the front end portion of the elastic conductive member and the solder pad is ensured so as to address a high voltage applied to the transfer roller. As a result, the transfer roller, etc. can be electrically connected to the power supply circuit board with certainty without increasing the number of components.
