Condenser optical system for light scanning system
AssigneeFuji Photo Film Co., Ltd.
InventorsKatsumi Shimada, Hiromi Ishikawa, Sumihiro Nishihata, Masaru Noguchi
Life of this patent
Estimating the term…
Abstract
In a condenser optical system for a light scanning system, a single lens focuses a light beam deflected by a reflecting surface of a deflector onto a surface to be scanned and causes the deflected light to scan the surface in a main scanning direction at a constant speed. A cylindrical mirror which has a refracting power only in a sub-scanning direction normal to the main scanning direction compensates for surface tilt of the reflecting surface. At least one surface of the single lens is toric to compensate for the surface tilt associated with the cylindrical mirror and the toric surface is aspheric in a main-scanning cross-section.
Claims8
A condenser optical system for a light scanning system comprising
- a single lens for focusing a light beam deflected by a reflecting surface of a deflector onto a surface to be scanned and causing the deflected light to scan the surface in a main scanning direction at a constant speed, and a cylindrical mirror for compensating for surface tilt of the reflecting surface which has a refracting power only in a sub-scanning direction normal to the main scanning direction, wherein at least one surface of said single lens is toric to compensate for the surface tilt associated with the cylindrical mirror and the toric surface is aspheric in a main-scanning cross-section.
Dependencies are inferred from the claim text.