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Title:
OPTICAL HEAD CARRYING DEVICE, INTEGRATED CIRCUIT FOR OPTICAL HEAD CARRYING DEVICE, FOCUSING LENS DRIVING DEVICE AND INTEGRATED CIRCUIT FOR FOCUSING LENS DRIVING DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/139012
Kind Code:
A1
Abstract:
When an optical head is carried in a radial direction of an optical disc, an optical head is first carried at a speed profile with a large acceleration. When abnormality is detected by an abnormality detecting circuit for detecting abnormality of a focus control system, the optical head is carried again at a speed profile with a small acceleration, so that a movable portion of a lens actuator is prevented from colliding with a fixed portion in the case the optical head is carried in the radial direction of the optical disc. Thus, an optical head carrying device, an integrated circuit for an optical head carrying device, a focusing lens driving device and an integrated circuit for a focusing lens driving device are provided to prevent increase in a starting-up time of the device and a lowering of a data reading speed from the optical disc.

Inventors:
YAMADA SHIN-ICHI
ISHIBASHI HIROSHIGE
Application Number:
PCT/JP2007/060693
Publication Date:
December 06, 2007
Filing Date:
May 25, 2007
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
YAMADA SHIN-ICHI
ISHIBASHI HIROSHIGE
International Classes:
G11B7/085; G11B7/095; G11B7/135
Foreign References:
JPH0628683A1994-02-04
JP2002183982A2002-06-28
JPH0536099A1993-02-12
JPS59178654A1984-10-09
JPH07176066A1995-07-14
JPH11316962A1999-11-16
JPH0294123A1990-04-04
JP2004071129A2004-03-04
Attorney, Agent or Firm:
HAYASE, Kenichi (4F The Sumitomo Building No.2,4-7-28, Kitahama, Chuo-k, Osaka-shi Osaka 41, JP)
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