Patent ID: 6317244
Filing Date: 2001-11-13
Classification: G02B,H04N

Abstract:
A light-scanning optical system comprising:a light source;a first optical system for trimming luminous flux emitted from said light source and imaging the trimmed luminous flux as linear luminous flux extending in a main scanning direction;a light deflector having a deflection surface near the imaging position of said first optical system for reflecting and deflecting incident luminous flux in the main scanning direction for a scanning operation;a second optical system for imaging said luminous flux reflected and deflected by said light deflector on a plane to be scanned, said second optical system taking a role of establishing a substantially conjugate relationship between the deflection surface of said light deflector and said plane to be scanned;a photodetector for detecting part of the luminous flux reflected and deflected by said light deflector and generating a write-start position synchronizing signal for controlling the timing of spotting the scanning start point on said plane to be scanned; anda luminous flux delimiting member arranged on the light path between said light deflector and said photodetector for delimiting the width of the incident luminous flux entering the photodetector.