| 摘要 |
The present invention relates to a laser diode (1) and a highly precise light information processor using the same, particularly a laser diode which controls the diameter of a current flowing through an active layer (54) and changes the emitting area of the active layer, a laser printer which is suited to half tone expression with high image quality by using the above semiconductor laser device, and an optical disk device which can record data surely. <IMAGE>
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