| 摘要 |
PURPOSE:To obtain a laser light source for plural beams containing an array of semiconductor lasers LD where the independent drive is possible for each LD, by using a circuit which increases the drive current to set the optical output at a fixed level set previously even when another LD is driven to constitute a drive circuit for at least one LD. CONSTITUTION:A gate element 11 is turned on when signals are applied to terminals 12 and 13, and a current flows to a load resistance 15. Otherwise the element 11 is kept off and no current flows to the resistance 15. When an adjacent recording semiconductor laser LD1 is emitting light, the threshold current of an LD2 increases. Then the element 11 is turned on and the drive current of the LD2 is also increased by an amount equal to the current i3 flowing to the resistance 15. While the deterioration of the optical output of the LD owing to the heat interference of an adjacent LD has an about 50musec time lag. Thus this drive circuit can follow satisfactorily said deterioration of the optical output. As a result, the optical output of the LD2 is always kept at a fixed level and stabilized. |
