Optical pickup device with split hologram element that diffracts

Details Optical pickup device with split hologram element that diffracts Optical pickup device with split hologram element that diffracts

1995-09-05

1998-06-02

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369112, 369109, 369 4423, G11B 7135

Patent

active

057611742

ABSTRACT:
An optical pickup device includes a light source irradiating a record medium with plural light spots of light emitted therefrom, a plurality of light detecting elelments to which reflected light of the light spots are guided, respectively, to adequately synthesize and compare outputs of said light detecting elements, thereby reading information recorded in tracks of the record medium, and detecting an tracking error and a focusing error, and a hologram element which splits light emitted from the light source into plural beams is disposed in an optical path between the light source and the record medium, said hologram element is split by a split line, said split line elongating in a direction perpendicular to a track of the medium on an optical axis, and a hologram pattern having a diffraction function which is substantially directed in the track direction is disposed on at least one side of said split line, thereby differentiating diffraction conditions on both sides of said split line from each other.

REFERENCES:
patent: 5446719 (1995-08-01), Yoshida et al.
patent: 5450387 (1995-09-01), Ono et al.
patent: 5490133 (1996-02-01), Nakamura et al.
patent: 5511059 (1996-04-01), Brazas, Jr.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1469158