Laser scanning apparatus

An image forming apparatus including a laser scanning apparatus to emit light fluxes and a photosensitive drum having an imaging surface to image the light fluxes, the image forming apparatus comprising:

• a first imaging optical system to magnify or reduce the light fluxes;
• a light deflector including a polygon mirror with a plurality of deflective reflection surfaces to deflect and reflect the light fluxes penetrated through the first imaging optical system at a constant linear velocity, and a spindle motor to rotate the polygon mirror at a constant velocity;
• and
• a second imaging optical system including a scanning lens having a refraction/reflection lens part to alternatively refract and reflect the light fluxes reflected from the light deflector so that the light fluxes are refracted at least two times.

A laser scanning apparatus including a light source to emit light fluxes, comprising:

• a first imaging optical system to magnify or reduce the light fluxes emitted from the light source in a given position and angle;
• a light deflector to deflect and reflect the light fluxes penetrated through the first imaging optical system;
• and
• a second imaging optical system including a plurality of scanning lenses, each having a refraction/reflection lens part to alternatively refract and reflect the light fluxes reflected from the light deflector.

A laser scanning apparatus, comprising:

• a plurality of light sources to emit light fluxes;
• a first imaging optical system to magnify or reduce the light fluxes emitted from the light sources in a given position and angle;
• a light deflector to deflect and reflect the light fluxes penetrated through the first imaging optical system;
• and
• a second imaging optical system to correct optical errors in the light fluxes reflected from the light deflector, and having a refraction/reflection lens part to alternatively refract and reflect the light fluxes reflected from the light deflector, the light deflector and the second imaging optical system being arranged to be symmetrical to the light sources.

A laser scanning apparatus including a light source to emit light fluxes, comprising:

• a first imaging optical system to magnify or reduce the light fluxes emitted from the light source in a given position and angle;
• a light deflector to deflect and reflect the light fluxes penetrated through the first imaging optical system;
• and
• a second imaging optical system to correct optical errors in the light fluxes reflected from the light deflector, and including only one f-theta lens having two refraction faces and a reflection face simultaneously formed at surfaces thereof, increasing optical performance and a degree of freedom in design and fabrication of the laser scanning apparatus.