Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1995-04-06
1997-11-04
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369109, G11B 1100
Patent
active
056847629
ABSTRACT:
An opto-magnetic head apparatus including a beam splitter for splitting laser light reflected from a photomagnetic recording medium into three bundles of light having different polarization directions in a specific plane. One of the three bundles of light is used as a servo-signal and the remaining two bundles of light are used as a data-signal. A diffracting element, which splits at least the bundle of light used as a servo signal into two bundles of light in a direction perpendicular to the direction in which the splitting of the laser light by the beam splitter occurs, provides a predetermined amount of positive or negative defocus to the bundles of light split by the diffracting element. The opto-magnetic head apparatus also includes a pair of servo-signal light receiving elements which receive the bundles of servo-signal light split by the diffracting element and which are located in a plane normal to the optical axis. Two data-signal light receiving elements, which receive the bundles of the data-signal light, are located in the same plane as the servo-signal light receiving elements.
REFERENCES:
patent: 4951274 (1990-08-01), Iwnaga et al.
patent: 5231620 (1993-07-01), Ohuchida
patent: 5247508 (1993-09-01), Tanaka
patent: 5272685 (1993-12-01), Ando
patent: 5278401 (1994-01-01), Takishima et al.
patent: 5280464 (1994-01-01), Itoh et al.
patent: 5293371 (1994-03-01), Koyama
patent: 5293569 (1994-03-01), Koyama
patent: 5309423 (1994-05-01), Noguchi et al.
patent: 5315574 (1994-05-01), Saimi et al.
patent: 5337300 (1994-08-01), Takishima et al.
patent: 5453963 (1995-09-01), Katayama et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Dinh Tan
LandOfFree
Opto-magnetic head 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 Opto-magnetic head apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Opto-magnetic head apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1838710