Light scanning apparatus

An optical scanning apparatus for optically scanning a medium, comprising:

• a light source for receiving image information and for emitting a light beam modulated in accordance with the image information;
• reflecting means including a first part defining a single reflective surface for reflecting the light beam emitted from said light source to direct the light beam to the medium, the reflecting means further including a second part;
• rotating means for rotating the single reflective surface of said reflecting means to allow the single reflective surface to scan the light beam on the medium in a scanning sweep;
• imaging means for receiving the light beam emitted from said light source and for converting the light beam into a focused light beam to be focused on the medium, the single reflective surface of said reflecting means receiving the focused light beam from said imaging means and directing the focused light beam to the medium;
• and
• preventing means for preventing the second part of said reflecting means for directing the light beam to be focused on the medium.