Optical scanning device

Details Optical scanning device Optical scanning device

2007-01-16

2007-01-16

Psitos, Aristotelis M (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112230, C359S719000, C250S201500

Reexamination Certificate

active

10492451

ABSTRACT:
An optical scanning device (1) for scanning an information layer (2) includes a radiation source (6) for supplying a radiation beam (14), a lens system (7) having an optical axis (OO′), and a detection system8) including: (i) an astigmatism generating element (9) for generating a first amount of astigmatism (W1) represented by a vector (Wo,1, θ1), so as to transform the radiation beam to a first astigmatic radiation beam (29); (ii) an astigmatism correcting element (27) for generating a second amount of astigmatism (W2) represented by a vector (Wo,2, θ2), so as to transform the first astigmatic radiation beam to a second astigmatic radiation beam (30) having a third amount of astigmatism (W3) represented by a vector (Wo,3, θ3), and (iii) a detector (28) for transforming the second astigmatic radiation beam to an electrical signal. According to the invention, W3is adapted to the detector and that Wo,2and θ2comply substantially with the following equation: (Wo,1, 2θ1)+(Wo,2, 2θ2)=(Wo,3, 2θ3).

REFERENCES:
patent: 5036185 (1991-07-01), Ando
patent: 6091692 (2000-07-01), Morimoto
patent: 6967908 (2005-11-01), Ogasawara et al.

Affiliated with

Also associated with

Rating

Optical scanning device 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 scanning device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical scanning device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3738627