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1. 发明专利

MY127375A OBJECTIVE LENS DRIVING DEVICE AND OPTICAL DISC APPARATUS USING THE SAME 未知
公开(公告)号：MY127375A
公开(公告)日：2006-11-30
申请号：MYPI20043431
申请日：1997-08-15
申请人： HITACHI LTD , HITACHI MEDIA ELECTRONICS CO LTD
发明人： SHINRO INUI , NAOHIKO OTOSHI , KATSUHIKO IZUMI , MICHIO MIURA , NAOMITSU KURODA , RYUICHIRO MIZUNO
IPC分类号： G11B7/00 , G11B7/08 , G11B7/09 , G11B7/135
摘要： IT IS AN OBJECT TO PERFORM A THIN AND COMPACT DESIGN OF THE OBJECTIVE LENS DRIVING DEVICE. IN ORDER TO ACHIEVE THE ABOVE OBJECT, OPTICAL BEAM (8) IS PASSED THROUGH A SPACE SURROUNDED BY A TRACKING COIL (4) AND A FOCUSING COIL (5) WHICH ARE ADJACENT TO EACH OTHER AND FIXED IN A HOLDER. FURTHER, IT IS ANOTHER OBJECT TO POSITION THE OBJECTIVE LENS WITH HIGH PRECISION IN AN OBJECTIVE LENS DRIVING DEVICE FOR SWITCHING A PLURALITY OF OBJECTIVE LENSES (7-1,7-2) IN ACCORDANCE WITH TYPE OF AN OPTICAL DISC. IN ORDER TO ACHIEVE THIS OBJECT, MAGNETIC SUBSTANCES WHICH ARE RADIALLY EXTENDED WITH THE SLIDING SHAFT (6) AT THE CENTER ARE PROVIDED IN THE LENS HOLDER (3), AND THE MAGNETIC SUBSTANCES (12) ARE LOCATED WITHIN A PLANE PERPENDICULAR TO THE PLANE CONSTITUTING THE MAGNETIC GAP AND AT THE OUTSIDE OF THE MAGNETIC GAP. STILL FURTHER, IN AN OBJECTIVE LENS DRIVING DEVICE IT IS ANOTHER OBJECT TO PREVENT THE OCCURENCE OF POSITIONAL DISPLACEMENT OF THE OBJECTIVE LENS (7) DUE TO RESISTANCE FORCE OF CURRENT SUPPLY MEANS SUCH AS FPC. TO ACHIEVE THIS OBJECT, A FIRST OBJECTIVE LENS (7-1) AND A SECOND OBJECTIVE LENS (7-2) ARE ARRANGED SO THAT THE OBJECTIVE LENS ARRANGEMENT ANGLE AT WHICH THE FIRST AND SECOND OBJECTIVE LENSES (7-1,7-2) ARE ARRANGED WITH RESPECT TO THE SHAFT CENTER OF THE SLIDING SHAFT (6) IS DISPLACED, BY A PREDETERMINED AMOUNT, FROM THE MAGNETIC CIRCUIT (1,2,9) ARRANGEMENT ANGLE AT WHICH THE MAGNETIC SUBSTANCES AND THE MAGNETS (2) ARE ARRANGED WITH RESPECT TO THE SHAFT CENTER OF THE SLIDING SHAFT (6).

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