Patent ID: 7064877
Filing Date: 2006-06-20
Classification: G02B

Abstract:
1. A scanning optical apparatus comprising: light source means; a first optical element that converts a light flux emitted from the light source means; a second optical element that converts the light flux emitted from the first optical element into a longitudinal linear image in a main scanning direction; a deflection element that scanningly deflects the light flux emitted from the second optical element; a third optical element that guides the light flux deflected by the deflection element to a surface to be scanned; a synchronous detection element that obtains a synchronous signal; and a fourth optical element that guides the light flux deflected by the deflection element to the synchronous detection element, wherein in a case where a point at which a principal ray traveling toward a scanning center on the surface to be scanned is deflected by the deflection element is assumed as a deflection point, the second optical element is located at a position which is farther from the deflection point than the further optical element, and wherein in a case where a focal distance of the third optical element within a main scanning section is given as f is satisfied.