Dynamic information storage or retrieval – Dynamic mechanism subsystem – Access of multiple storage elements
Patent
1991-01-15
1993-08-10
LaRoche, Eugene R.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Access of multiple storage elements
360 9702, 369283, 369 13, G11B 2102, G11B 3314
Patent
active
052355918
ABSTRACT:
A separation type optical head according to the present invention includes at least a light source portion for emitting collimated beams, a focusing device (a focusing lens) for focusing the collimated beams onto an information recording surface of an optical disc medium, a focal point control mechanism for the position of the spot on the information recording surface, and a photo-detection portion for receiving beams reflected by the information recording surface. The structure is divided into a fixed portion including the light source portion and the photo-detection portion and a movable portion including the focusing device (focusing lens) and the focal point control mechanism. At least the movable portion of the separation type optical head is movably accommodated n a frame (sealing case) for the optical head so as to prevent irregular vibrations of the movable portion due to high speed air flows or turbulence. Furthermore, a focal point control mechanism of an air float type may be employed in the movable portion of the separation type optical head so as to actively utilize the high speed air flow generated due to the rotation of the disc medium to perform a rough adjustment of the focal point of the focusing device.
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Hamakawa Yoshihiro
Kasai Masuo
Matsumoto Kiyoshi
Mita Seiichi
Miyamura Yoshinori
Hitachi , Ltd.
Kessell Michael C.
LaRoche Eugene R.
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