Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-08-07
2007-08-07
Hindi, Nabil (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112070
Reexamination Certificate
active
10817836
ABSTRACT:
An optical head is provided with: an objective-lens-use opening that determines an aperture of the objective lens; a light-source light-quantity controlling opening that aperture-controls light that has been separated by the light separation device; a light detector that receives light that has been aperture-controlled by the light-source light-quantity controlling opening; and a light detector that receives light that has been reflected by the optical recording medium, and has an arrangement in which: the length of the optical light path from the spherical aberration correcting device to the objective-lens-use opening is made virtually the same as a length of the optical light path from the spherical aberration correcting device to the light-source light-quantity controlling opening, and the aperture of the light-source light-quantity controlling opening has virtually the same size as the aperture of the objective-lens-use opening. The objective of the present invention is to provide an optical head in which a signal outputted from the light quantity detection device is unchanged even when the spherical aberration correcting device is driven so that by using this signal, the quantity of light from the light source is set to an appropriate value.
REFERENCES:
patent: 6115336 (2000-09-01), Okada
patent: 6498330 (2002-12-01), Yoshida
patent: 6721259 (2004-04-01), Yamamoto et al.
patent: 7054252 (2006-05-01), Sato et al.
patent: 2002/0036958 (2002-03-01), Wada et al.
patent: 1229231 (1999-09-01), None
patent: 1229234 (1999-09-01), None
patent: 10-334575 (1998-12-01), None
patent: 11-344666 (1999-12-01), None
patent: 2000-171346 (2000-06-01), None
patent: 2000-171349 (2000-06-01), None
patent: 2002-109776 (2002-04-01), None
Hayashi Hideki
Kamei Tomotada
Mizuno Sadao
Wada Hidenori
LandOfFree
Optical head and optical recording and reproducing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical head and optical recording and reproducing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head and optical recording and reproducing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3859993