Claims
- 1. An optomagnetic recording polarization optical apparatus in which light is radiated on an optomagnetic recording medium so as to detect rotation of a polarization plane of a reflected light so as to read recorded data,
- wherein a prism for guiding the reflected light component to a light-receiving element is formed on a same substrate, including first and second light-receiving elements formed on a semiconductor substrate;
- a polarizing film, formed on at least said first and second light-receiving elements, for transmitting a first light component which is a linearly polarized light component and for reflecting a second light component which is a linear polarized light component having a polarization plane perpendicular to that of the first light component;
- said prism mounted on said polarizing film; a .lambda./4 plate mounted on a surface of said prism which is opposite to a surface on which said polarizing film is mounted; and
- a total reflection film formed on said .lambda./4 plate.
- 2. An optomagnetic recording polarization optical apparatus comprising:
- a laser diode fixed on a semiconductor substrate, for emitting a first light component which is a linear polarized light component;
- a first polarization beam splitter mounted on said semiconductor substrate for reflecting at least part of the first light component and transmitting a second light component which is a linear polarized light component having a polarization plane perpendicular to that of the first light component;
- a .lambda./2 plate mounted on said semiconductor substrate wherein the second light component transmitted through said first polarization beam splitter is incident on said .lambda./2 plate;
- a second polarization beam splitter mounted on said semiconductor substrate for reflecting the first light component and transmitting the second light component, and the light component which is transmitted through said .lambda./2 plate is incident on said second polarization beam splitter;
- a prism, mounted on said semiconductor substrate and the light component reflected by said second polarization beam splitter incident on said prism and focused; and
- first and second light-receiving elements, mounted on said semiconductor substrate, the light component transmitted through said second polarization beam splitter and the focused light component incident on said first and second light-receiving elements, respectively.
- 3. An optomagnetic recording polarization optical apparatus comprising:
- a laser diode mounted on a semiconductor substrate for emitting a first light component serving as a linear polarized light component;
- a first polarization beam splitter mounted on said semiconductor substrate for reflecting at least a part of the first light component and transmitting a second light component which is a linear polarized light component having a polarization plane perpendicular to that of the first light component;
- a .lambda./2 plate mounted on said semiconductor substrate, a light component transmitted through said first polarization beam splitter incident on said .lambda./2 plate;
- a second polarization beam splitter mounted on said semiconductor substrate for reflecting the first light component, and transmitting the second light component, and a light component which is transmitted through said .lambda./2 plate incident on said second polarization beam splitter;
- a prism mounted on said semiconductor substrate, the light component reflected by said second polarization beam splitter incident on said prism and focused;
- first and second light-receiving elements mounted on said semiconductor substrate, the light component transmitted through said second polarization beam splitter and the focused light component incident on said first and second light-receiving elements, respectively,
- a half mirror mounted on said semiconductor substrate for reflecting part of output light from said laser diode for emitting the first light component serving as the linear polarized light component; and a third receiving element formed on said semiconductor substrate, the first light component reflected by said half mirror incident on said third receiving element.
Priority Claims (3)
Number |
Date |
Country |
Kind |
3-359406 |
Dec 1991 |
JPX |
|
4-030044 |
Jan 1992 |
JPX |
|
4-034205 |
Jan 1992 |
JPX |
|
Parent Case Info
This is division, of application Ser. No. 07/996,149, filed Dec. 23, 1992, now U.S. Pat. No. 5,350,917.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4262198 |
Gupta et al. |
Apr 1981 |
|
4695719 |
Wilwerding |
Sep 1987 |
|
4725725 |
Ando 250216 |
Feb 1988 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
0278406 |
Aug 1988 |
EPX |
0439876 |
Aug 1991 |
EPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
996149 |
Dec 1992 |
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