초록 ▼

At least two light beam detection units are spaced at a predetermined distance and provided in the scanning direction of a surface to be scanned. A light beam is emitted to the light beam detection unit provided on a scanning start side, by lighting a light beam source which is employed to scan the

At least two light beam detection units are spaced at a predetermined distance and provided in the scanning direction of a surface to be scanned. A light beam is emitted to the light beam detection unit provided on a scanning start side, by lighting a light beam source which is employed to scan the surface linearly during a scanning period equivalent to 1 dot during scanning. A light beam is emitted to the light beam detection unit provided on a scanning end side, by lighting the light beam source during the scanning period after elapse of a light-off period computed from a previously designed scanning speed and the predetermined distance. Based on a detection result of the light beam detection unit provided on the scanning start side and a detection result of the light beam detection unit provided on the scanning end side, scanning characteristics required of the light beam are evaluated.

대표청구항 ▼

[ What is claimed is:] [1.]1. A light beam characteristic evaluation method comprising the steps of:providing at least two light beam detection means spaced at a predetermined distance in a scanning direction of a surface to be scanned, including a first light beam detection means provided on a scan

[ What is claimed is:] [1.]1. A light beam characteristic evaluation method comprising the steps of:providing at least two light beam detection means spaced at a predetermined distance in a scanning direction of a surface to be scanned, including a first light beam detection means provided on a scanning start side and a second light beam detection means provided on a scanning end side;emitting a light beam to the first light beam detection means provided on the scanning start side by lighting a light beam source, wherein said light beam is configured to scan said surface linearly during a scanning period equivalent to 1 dot during scanning;emitting a second light beam to the light beam detection means provided on the scanning end side by lighting said light beam source during said 1 dot scanning period after elapse of a light-off period computed from a previously designed scanning speed and said predetermined distance; andevaluating characteristics of said light beam, based on a detection result of said first light beam detection means provided on said scanning start side and a detection result of said second light beam detection means provided on said scanning end side.