Image forming apparatus

Abstract

The image forming apparatus in this disclosure includes a main body, a plate-shaped frame member, a perforated portion, a sound generating source, an external cover member, and a space forming portion. The plate-shaped frame member configures a part or the whole of the side surface of the main body. The perforated portion has a plurality of holes and is formed in the frame member. The sound generating source is an inner portion of the main body and is disposed at a position corresponding to the perforated portion. The external cover member is disposed at and separated by a predetermined distance from the frame member on an outer side of the frame member. The space forming portion forms a space between the perforated portion and the external cover member that is tightly enclosed except for the perforated portion.

1 . An image forming apparatus comprising:
 a main body;   a plate-shaped frame member configuring a part or the whole of the side surface of the main body;   a perforated portion having a plurality of holes and formed in the frame member;   a sound generating source in an inner portion of the main body and disposed at a position corresponding to the perforated portion;   an external cover member disposed at and separated by a predetermined distance from the frame member on an outer side of the frame member; and   a space forming portion forming a space between the perforated portion and the external cover member, the space forming portion being tightly enclosed except for the perforated portion.   
     
     
         2 . The image forming apparatus according to  claim 1 , wherein the sound generating source is a gear train mounted on the frame member. 
     
     
         3 . The image forming apparatus according to  claim 1 , further comprising an annular rib projecting on an inner surface of the outer covering member, and
 the space forming portion configured by the rib, the outer surface of the perforated portion, and the inner surface of the outer covering member.   
     
     
         4 . The image forming apparatus according to  claim 3 , wherein the frame member comprises a bulging portion that projects on a main body inner portion, and
 the perforated portion is formed on the bulging portion.   
     
     
         5 . The image forming apparatus according to  claim 1 , wherein the plurality of holes that configure the perforated portion is formed with an aperture diameter and a hole interval that are set in response to the frequency band of the sound of the sound generating source. 
     
     
         6 . The image forming apparatus according to  claim 1 , wherein the space forming portion sets the interval between the inner surface of the outer covering member and the outer surface of the perforated portion in response to the frequency band of the sound generated by the sound generating source. 
     
     
         7 . The image forming apparatus according to  claim 1 , wherein the sound generating source includes a motor that drives the gear train, and
 the motor is disposed in a space formed by the space forming portion.