Optical head with provision for tracking and focussing control

Details Optical head with provision for tracking and focussing control Optical head with provision for tracking and focussing control

1986-11-19

1987-12-22

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 369110, 369121, 250201, G11B 700

Patent

active

047150246

ABSTRACT:
An optical head for reading a signal recorded along spiral or concentric tracks on an optical disc including a semiconductor laser for emitting a linearly polarized light beam, a polarization prism for transmitting the light beam, an objective lens for projecting the light beam upon the optical disc and for collecting a light beam reflected by the optical disc, a critical angle prism for totally reflecting the light beam reflected by the polarization prism and a light detector for receiving the light beam totally reflected by an optical surface of the critical angle prism. The polarization prism and critical angle prism are integrally coupled with each other to form an assembly of prisms which is rotated to adjust an incident angle of the light beam impinging upon the optical surface of critical angle prism substantially at a critical angle of total reflection.

REFERENCES:
patent: 4422168 (1983-12-01), Ito et al.
patent: 4425636 (1984-01-01), Musha et al.
patent: 4455085 (1984-06-01), Kato et al.
patent: 4505584 (1985-03-01), Kato et al.
patent: 4525825 (1985-06-01), Ito et al.
patent: 4574371 (1986-03-01), Takemura et al.

Affiliated with

Also associated with

Rating

Optical head with provision for tracking and focussing control 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 head with provision for tracking and focussing control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head with provision for tracking and focussing control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-821945