Disc drive apparatus for more than one type of disc

Details Disc drive apparatus for more than one type of disc Disc drive apparatus for more than one type of disc

1997-08-21

2000-02-01

Huber, Paul W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4427, G11B 390

Patent

active

060211024

ABSTRACT:
The present invention provides a disc drive apparatus which identifies a type of a disc mounted on the apparatus by using reflected beam data obtained from a laser beam focused on the disc surface and other reflected beam data obtained from the laser beam being focused on the disc signal plane. For example, while forcibly changing the laser beam focusing point within a variable range at a predetermined velocity, a luminous energy signal or a focus error signal is used to count a time difference between a timing of focusing on the disc surface and a timing of focusing on the disc signal plane. According to the time difference obtained, the disc mounted is identified as a first type of disc or a second type of disc.

REFERENCES:
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5724325 (1998-03-01), Jeong
patent: 5757742 (1998-05-01), Akiba et al.
patent: 5774438 (1998-06-01), Park et al.
patent: 5831953 (1998-11-01), Numata
C. W. Lee et al., "A Compact-Disc-Compatible Digital Versatile Disc Pickup Using Annular Mask," JPN. J. Appl. Phys., vol. 36, Part 1, No. 1B, Jan. 1997, pp. 486-490.
Y. Tsuchiya et al., "Digital Video Disc/Compact Disc Compatible Pick-Up with Liquid Crystal Shutter," JPN. J. Appl. Phys., vol. 36, Part 1, No. 1B, Jan. 1997, pp. 481-485.
R. Katayama et al., "Dual Wavelength Optical Head for 0.6 MM and 1.2 MM Substrate Thicknesses," JPN. J. Appl. Phys., vol. 36, Part 1, No. 1B, Jan. 1997, pp. 460-466.

Affiliated with

Also associated with

Rating

Disc drive apparatus for more than one type of disc does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disc drive apparatus for more than one type of disc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc drive apparatus for more than one type of disc will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-943223