Laser beam printer with cooling arrangements for optical box

A laser beam printer apparatus comprising:

• a photosensitive member;
• deflector means for deflecting a laser beam;
• a plastic lens which transmits the laser beam deflected by said deflector means;
• an optical box containing at least said deflector means and said plastic lens;
• developer means for applying a toner to said photosensitive member so as to develop a latent image which has been formed on said photosensitive member by a laser beam emitted from said optical box, the toner image developed by said developer means being transferred to a recording medium;
• conveying means for conveying a recording medium to said photosensitive member;
• and
• an electronic package unit for controlling said laser beam printer apparatus,
• wherein said conveying means is arranged between said optical box and said electronic package unit.

A laser beam printer apparatus comprising:

• deflector means for deflecting a laser beam;
• a plastic lens which transmits the laser beam deflected by said deflector means;
• an optical box containing at least said deflector means and said plastic lens;
• a cover member covering said optical box;
• and
• cooling means for cooling said optical box,
• wherein at least one of said optical box and said cover member has a fin for cooling.

A laser beam printer apparatus comprising:

• deflector means for deflecting a laser beam;
• a lens which transmits the laser beam deflected by said deflector means;
• an optical box containing at least said deflector means and said lens;
• and
• cooling means for cooling said optical box,
• wherein said cooling means is provided near said optical box and is electrically connected to said optical box.