| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce costs at a light-emitting element array part in an image- forming apparatus and eliminate characteristic compensation among element arrays by using a one-chip light-emitting element array and constituting four one-chip light-emitting element arrays arranged for each photosensitive body of a single substrate. SOLUTION: Each of a yellow light-emitting element array 200a, a magenta light-emitting element array 200b, a cyan light-emitting element array 200c and a black light-emitting element array 200d uses a one-chip light-emitting element array arranged to cover the whole area of a main scan distance in a main scan direction when each photosensitive drum rotates and moves. Each light-emitting element array is integrated into one chip having a plurality of light-emitting elements arranged with a high resolution not lower than, e.g. 600 dpi to cover the whole area of the main scan distance of the photosensitive body. Preferably, the one-chip light-emitting element array used for the light- emitting element arrays 200a, 220b, 200c, 200d is formed of a single substrate which is cut and separated to four to obtain the arrays.</p> |
