Focusing distance of an objective lens according to a vertical d

Details Focusing distance of an objective lens according to a vertical d Focusing distance of an objective lens according to a vertical d

1997-07-16

1999-03-16

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4437, 369 94, G11B 7125

Patent

active

058838732

ABSTRACT:
An optical recording and reproducing device of the present invention has an objective lens designed so as to form a light spot with a set diameter on a DVD, while to form, on a CD, a light spot with a set diameter different from the above diameter. Respective working distances WD1 and WD2 with respect to the DVD and the CD are set in accordance with deflection standards F for the DVD and the CD, respectively. By doing so, as compared with conventional cases where the deflection standards F are not taken into consideration, the working distance WD1 is decreased. As a result, the device is thinned, compared with the conventional cases.

REFERENCES:
patent: 5526336 (1996-06-01), Park et al.
patent: 5638353 (1997-06-01), Takahashi
patent: 5665957 (1997-09-01), Lee et al.
patent: 5671207 (1997-09-01), Park
patent: 5699341 (1997-12-01), Sugi et al.
patent: 5724334 (1998-03-01), Ohba et al.
"A Compact Disc Compatible Digital Video Disc Pickup Using Annular Mask" Chul Woo Lee, et al., International Symposium on Optical Memory and Optical Data Storage, vol. 12, 1996 Technical Digest Series (Optical Society of America), pp. 348-350.

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