Hologram optical system for optical pickup for optical disk driv

Details Hologram optical system for optical pickup for optical disk driv Hologram optical system for optical pickup for optical disk driv

1996-07-29

1997-12-09

Edun, Muhammad N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4412, G11B 7135

Patent

active

056967489

ABSTRACT:
A hologram optical system includes a stem, a laser diode fixed to the stem, and a focusing error detector fixed to the stem. The focusing error detector is divided into a first region and a second region by at least one straight dividing line. The hologram optical system further includes a cap mounted on the stem so as to surround the laser diode and the focusing error detector, and a hologram mounted on the cap so as to make given positional relationship with the laser diode and the focusing error detector. When the dividing line of the focusing error detector has a positive gradient, the hologram has a distribution of interference fringes such that the product of a change rate of an X-directional component of the pitch of the interference fringes and a change rate of a Y-directional component of the pitch of the interference fringes is negative. In contrast, when the dividing line of the focusing error detector has a negative gradient, the hologram has a distribution of interference fringes such that the product of the change rate of the X-directional component and the change rate of the Y-directional component of the pitch is positive.

REFERENCES:
patent: 4665310 (1987-05-01), Heemskerk
patent: 4835378 (1989-05-01), Coops
patent: 4908506 (1990-05-01), Coops
patent: 5422870 (1995-06-01), Kojima et al.
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5581523 (1996-12-01), Seki et al.

Affiliated with

Also associated with

Rating

Hologram optical system for optical pickup for optical disk driv does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hologram optical system for optical pickup for optical disk driv, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hologram optical system for optical pickup for optical disk driv will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1613452