Title:
OPTICAL HEAD DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/037479
Kind Code:
A1
Abstract:
An optical head device is provided with at least one start up mirror (30), a plurality of
objective lenses (7, 14), an objective lens actuator (13) and a moving mechanism (33).
The start up mirror (30) permits a luminous flux, which has a prescribed wavelength
and emitted from semiconductor lasers (1, 9), to enter and changes its direction.
The objective lenses (7, 14) have different numerical apertures, condense the
luminous flux the direction of which is changed by the start up mirror (30), and
irradiate an information recording medium (8). The objective lens actuator
(13) moves the objective lenses (7, 14) in a focus direction of the information recording
medium (8) to have the luminous flux entered the information recording medium
(8) focused. The moving mechanism (33) moves the start up mirror (30) to have the
luminous flux enter the information recording medium (8) through one of the objective
lenses (7, 14).
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Inventors:
NAKATA HIDEKI
AIKOH HIDEKI
AIKOH HIDEKI
Application Number:
PCT/JP2006/319701
Publication Date:
April 05, 2007
Filing Date:
October 02, 2006
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
NAKATA HIDEKI
AIKOH HIDEKI
NAKATA HIDEKI
AIKOH HIDEKI
International Classes:
G11B7/135
Foreign References:
| JPH09198704A | 1997-07-31 | |||
| JPH09265634A | 1997-10-07 | |||
| JPH0917005A | 1997-01-17 | |||
| JPH09120559A | 1997-05-06 | |||
| JPH09120561A | 1997-05-06 | |||
| JP2005353261A | 2005-12-22 |
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (IMP Building 3-7, Shiromi 1-chome, Chuo-k, Osaka-shi Osaka 01, JP)
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