Claims
- 1. An optical pickup, comprising:
- a semiconductor substrate;
- light-emitting means, mounted on said semiconductor substrate, for emitting a light beam;
- a phase layer disposed in the semiconductor substrate, for developing a phase difference between the light beam emitted by the light-emitting means and a reflected information light beam reflected by an optical information storage medium;
- a polarizer layer disposed underneath said phase layer in the semiconductor substrate, for selectively reflecting and passing the light beams which have passed through said phase layer, said reflected light beam being reflected off said storage medium and constituting said reflected information light beam; and
- light-diffracting means disposed in the semiconductor substrate, for dividing reflected information light beam reflected by the optical information storage medium and passing through said polarizer layer into a transmitted light beam and a diffracted light beam.
- 2. An optical pickup according to claim 1, further including a core layer disposed in the semiconductor substrate, an optical waveguide disposed between said core layer and the light-diffracting means, a first photodetector disposed on a side surface of said core layer remote from said optical waveguide, for detecting the transmitted light beam from said light-diffracting means, and a second photodetector disposed on an end surface of said optical waveguide, for detecting the diffracted light beam from said light-diffracting means through said optical waveguide.
- 3. An optical pickup according to claim 1, wherein said phase layer changes a phase of the light beam emitted by said light-emitting means and a phase of the reflected information light beam by 54.degree. respectively.
- 4. An optical pickup according to claim 1, wherein said light-diffracting means comprises at least two regions for dividing the light beam into the transmitted light beam having a greater intensity than the intensity of the diffracted light beam.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2-196707 |
Jul 1990 |
JPX |
|
2-196710 |
Jul 1990 |
JPX |
|
Parent Case Info
This is a divisional of application Ser. No. 07/652,814 filed Feb. 8, 1991 U.S. Pat. No. 5,164,930.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
4733065 |
Hoshi et al. |
Mar 1988 |
|
4893296 |
Matsumoto et al. |
Jan 1990 |
|
5070488 |
Fukushima et al. |
Dec 1991 |
|
5105403 |
Kando et al. |
Apr 1992 |
|
5107477 |
Fujita et al. |
Apr 1992 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
652814 |
Feb 1991 |
|