Patent ID: 8913096
Filing Date: 2014-12-16
Classification: B41J,G02B

Abstract:
1. An optical scanning device that scans a scanning surface in a main scanning direction, the optical scanning device comprising: a light source that includes a surface emitting laser; an optical deflector that includes a reflection surface that reflects a light flux from the light source while rotating around a rotation axis; a monitor light receiving element that receives a monitor light flux; a synchronization detection light receiving element that receives a synchronization detection light flux; a monitor optical system that directs the monitor light flux to the monitor light receiving element, the monitor light flux reflected on the reflection surface; a synchronization detection optical system that directs the synchronization detection light flux to the synchronization detection light receiving element, the synchronization detection light flux reflected on the reflection surface; and a scanning optical system that directs a scanning light flux to the scanning surface, the scanning light flux reflected on the reflection surface, wherein a combined focal length of the monitor optical system in the main scanning direction is smaller than a combined focal length of the synchronization detection optical system in the main scanning direction, six different timings t the monitor optical system is disposed on an optical path of the monitor light flux, which is reflected on the reflection surface during a time period from t the synchronization detection optical system is disposed on an optical path of the synchronization detection light flux, which is reflected on the reflection surface during a time period from t the scanning optical system is disposed on an optical path of the scanning light flux, which is reflected on the reflection surface during a time period from t the monitor light receiving element is in a conjugate relationship in the main scanning direction with a cross point of: an extension of a line obtained by projecting the light flux reflected on the reflection surface at the timing t and an extension of a line obtained by projecting the light flux reflected on the reflection surface at the timing t