Dynamic optical information storage or retrieval – Dynamic mechanism optical subsystem – Transducer carriage or actuator
Reexamination Certificate
2008-06-17
2008-06-17
Chen, Tianjie (Department: 2627)
Dynamic optical information storage or retrieval
Dynamic mechanism optical subsystem
Transducer carriage or actuator
Reexamination Certificate
active
07389519
ABSTRACT:
An optical head includes a fixed part, a movable part movably held by a plurality of wires fixed on the fixed part, and magnets fixed to the fixed part. The movable part includes a movable-part housing, a heatsink held by the movable-part housing, a light emitting element and a light receiving element both mounted on the heatsink, magnets provided to both sides of the movable-part housing to contact the heatsink, an objective lens held by the movable-part housing to allow an emitted laser beam from the light emitting element to focus, and a diffraction grating provided between the objective lens and the light emitting element and between the objective lens and the light receiving element. The gap between each coil and the adjacent magnet is filled with ferrofluid having a higher thermal conductivity than the atmosphere.
REFERENCES:
patent: 4386823 (1983-06-01), Musha
patent: 4479051 (1984-10-01), Musha
patent: 5615203 (1997-03-01), Fukakusa
patent: 7113351 (2006-09-01), Hovanky
patent: 2003/0198149 (2003-10-01), Kuwayama et al.
patent: 2004/0174614 (2004-09-01), Hovanky
patent: 2004/0223423 (2004-11-01), Tsuda
patent: 06-302000 (1994-10-01), None
patent: 8-287499 (1996-11-01), None
patent: 08287499 (1996-11-01), None
patent: 10-177733 (1998-06-01), None
patent: 11-339291 (1999-12-01), None
patent: 2000-057602 (2000-02-01), None
patent: 2000-099968 (2000-04-01), None
Foreign Office Action with mail date Dec. 11, 2007 for Patent Application No. 2003-174348 with English Translation.
Okuda Takuya
Onozawa Kazutoshi
Yamanaka Kazuhiko
Chen Tianjie
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
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