Optical head

Abstract

Abstract PURPOSE:To prevent the generation of a track offset by providing the 1st and 2nd coils which pierce through a magnetic gap of a magnetic circuit member and have prescribed angles in the magnetic gap. CONSTITUTION:When the 1st coil 27 is conducted toward an arrow (g) and the 2nd coil 28 is conducted toward and arrow (j) respectively, the forces f1' and -f2' of motion are produced at both coils 27 and 28 respectively. An objective lens holder 17 is moved toward an arrow (k) together with a carriage 21 by the synthetic force F' of both forces f1' and -f2'. While the synthetic force -F' is produced when the coils 27 and 28 are conducted toward the arrow heads (h) and (i) respectively. Then the holder 17 is moved toward an arrow head (l) together with the carriage 21. Then the prescribed track control or the access control is carried out by controlling the condition direction, the conduction current value or the conduction time of both coils 27 and 28. Thus the stable reading reproduction signal is always secured with no track offset.

Inventors

• 👤 Takayuki Takeda
• 👤 竹田　高幸
• 👤 Yutaka Mazaki
• 👤 裕 真崎

Bibliographic Details