An imaging device is provided, in which a front sheet metal casing and/or a back sheet metal casing can be secured to a top sheet metal casing without the necessity of providing any screw holes in the top surface of the top sheet metal casing in order to secure the top sheet metal casing to the front sheet metal casing and/or the back sheet metal casing. The top sheet metal casing includes a top plate and a secured sheet metal casing secured to the top plate such that at least a portion of its perimeter is spaced apart from the top plate at a predetermined distance. A flange provided to the front or back sheet metal casing is inserted between the top plate and the secured sheet metal plate, so that an engagement pin provided to the secured sheet metal plate is fitted in an engagement hole provided in the flange, thereby securing the front or back sheet metal casing to the top sheet metal casing.
1. An imaging device comprising exterior members including a top sheet metal casing secured to a front sheet metal casing or a back sheet metal casing, wherein,
the top sheet metal casing has a multi-layered structure including a top plate, and a catch plate secured to the top plate such that at least a portion of its perimeter is spaced apart from the top plate at a predetermined distance,
the front sheet metal casing or the back sheet metal casing has an insertion portion disposed between the top plate and the catch plate that are spaced apart at said predetermined distance, and
in a completely assembled state of the top sheet metal casing with the front sheet metal casing or the back sheet metal casing, the insertion portion is disposed between the top plate and the catch plate with the catch plate being deformed so as to enlarge said predetermined distance, the catch plate is biased toward the top plate and pressed upon the insertion portion, and the insertion portion is secured to the catch plate.
2. The imaging device according to claim 1 , wherein,
a projection is provided to the catch plate so as to project toward the top plate,
a recess is provided in the insertion portion so as to receive the projection, and
the projection is fitted in the recess to secure the insertion portion to the catch plate.
3. The imaging device according to claim 1 , wherein,
a projection is provided to the insertion portion so as to project toward the catch plate,
a recess is provided in the catch plate so as to receive the projection, and
the projection is fitted in the recess to secure the insertion portion to the catch plate.