Optical pickup device with substantially mutually orthogonal ref

Details Optical pickup device with substantially mutually orthogonal ref Optical pickup device with substantially mutually orthogonal ref

1993-05-17

1998-11-10

Young, W. R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369112, G11B 700

Patent

active

058354727

ABSTRACT:
An integrated optical pickup device for a magnetooptical recording medium (e.g. a magnetooptical recording disk) and/or an optical recording medium (e.g. an optical recording disk) in which a plurality of focusing grating couplers are formed on an optical waveguide layer manufactured on a substrate. A light reflected from a magnetooptical disk or an optical disk is guided by the focusing grating couplers into the waveguide layer to be separated and to be converged therethtough. The converged lights are detected so as to produce a tracking error signal, a focusing error signal, and an information readout signal. The plural focusing grating couplers are fabricated at an identical location on the waveguide in a superimposed fashion. This increases the utilization efficiency of reflection light per each unitary area of the focusing grating couplers and hence the signals are obtained in a stable state.
Between a semiconductor laser and a collimation lens, there is formed a composite beam splitter having two reflection surfaces. Reflection lights from the magnetooptical disk are respectively reflected by these reflection surfaces and are then received by photosensors. Analyzers are disposed respectively on front sides of the photosensors. The analyzers respectively have polarization directions orthogonal to each other. Each photosensor includes three-partition photodiode. The beam sizing method and the push-pull detection methods are used for detecting the focusing and tracking errors.
The optical pickup device can also used to read data from an optical disk.
A prism is disposed between a semiconductor laser and a collimation lens. The prism has two reflection surfaces. Reflection lights from a magnetooptical disk are respectively reflected by these reflection surfaces to be received by photosensors. On front sides of the photosensors, there are respectively arranged analyzers respectively having polarization directions orthogonal to each other.

REFERENCES:
patent: 4926403 (1990-05-01), Tsuyuguchi et al.
patent: 4951274 (1990-08-01), Iwanaga et al.
patent: 4953124 (1990-08-01), Koyama
patent: 4984901 (1991-01-01), Maury
patent: 5070493 (1991-12-01), Marshall et al.
patent: 5105399 (1992-04-01), Shimonou
patent: 5105415 (1992-04-01), Tayefeh
patent: 5132959 (1992-07-01), Ishika
patent: 5218852 (1993-06-01), Marchant

Affiliated with

Also associated with

Rating

Optical pickup device with substantially mutually orthogonal ref 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 substantially mutually orthogonal ref, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pickup device with substantially mutually orthogonal ref will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1524449