Abstract: Provided is an image pickup lens that forms an image on an image pickup element with light from a subject. In the image pickup lens, a lens that is disposed on an image pickup element side is fixed in position, and a focusing lens group having a plurality of lenses including a lens closest to the subject is moved in an optical axis direction, thereby performing focusing.

Abstract: The present invention provides a wide-angle optical system constituted of, in order from the object side to the image side, front group 11, stop 12, and rear group 13. The front group 11 is constituted, in order from the object side to the image side, of first lens 111 having negative optical power, second lens 112 having negative optical power, and third lens 113 having positive optical power. The rear group 13 is constituted, in order from the object side to the image side, of fourth lens 131 having positive optical power, and fifth lens 132 having negative optical power. The opposite surface from the stop of each of the paired lenses 113 and 131 arranged at the both sides of the stop 12 is a convex surface.

Abstract: An electrophotographic image forming apparatus on which a process cartridge having a memory device having a cartridge electrical contact is detachably mountable has an openable and closable cover, a main body positioning portion for positioning a positioning member provided on the process cartridge to thereby position the process cartridge relative to the main body of the electrophotographic image forming apparatus when the process cartridge is to be mounted on the main body of the electrophotographic image forming apparatus, a main body electrical contact portion electrically connected to the cartridge electrical contact portion, and a moving member for making the main body electrical contact portion movable in operative association with the opening and closing operation of the openable and closable cover.

Abstract: An electrophotographic image forming apparatus on which a process cartridge having a memory device having a cartridge electrical contact is detachably mountable has an openable and closable cover for opening and closing an opening, a main body positioning portion for positioning a positioning member provided on the process cartridge to thereby position the process cartridge relative to the main body of the electrophotographic image forming apparatus when the process cartridge is to be mounted on the main body the electrophotographic image forming apparatus, a main body electrical contact portion electrically connected to the cartridge electrical contact portion, and a moving member for making the main body electrical contact portion movable in operative association with the opening and closing operation of the openable and closable cover.