Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2008-05-27
2008-05-27
Castro, Angel (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C720S683000
Reexamination Certificate
active
11453639
ABSTRACT:
The invention provides an optical disc apparatus which restricts an operation sound generated from an objective lens driving portion of an optical pickup and has a reduce sound, in an optical disc apparatus, in particular, an optical disc apparatus installing a microphone for recording an external voice therein. Coils (107, 108), a magnet (109) and opposing surfaces of a yoke (110) are respectively arranged at substantially point symmetrical positions with respect to an optical axis (111) of an objective lens (103) in a state in which no electric current is applied, the yoke (110) and a unit base (117) are connected via a spring member (118), and the unit base (117) is mounted to a casing (120). In this case, the spring member (118) is connected at a position (121) forward apart from the objective lens (103) with respect to the yoke (110), and is formed so as to have at least a deformation freedom in a direction of the optical axis of the objective lens (103). The casing (120) is made in a closed structure surrounding a space in which the unit base (117), a lens holder (106), the yoke (110) and the magnet (109) are arranged, except a surface opposing to a disc-like recording medium (104).
REFERENCES:
patent: 4462096 (1984-07-01), Kusaka
patent: 5621576 (1997-04-01), Yamauchi et al.
patent: 7076791 (2006-07-01), Mori et al.
Inoue Atsushi
Kamisada Toshimasa
Mizuno Ryuichiro
Mori Hiromitsu
Nagai Kyuichiro
Castro Angel
Hitachi , Ltd.
Townsend and Townsend / and Crew LLP
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